265 results on '"John Wei"'
Search Results
2. Comparison of postoperative analgesia and side effects in pediatric laparoscopic surgery with morphine and nalbuphine
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Jia Chen, Cheng-Yu Wang, John Wei Zhong, Yu-Hang Cai, Jianmin Zhang, Fang Wang, Mazhong Zhang, Hongbin Gu, Hong-Yu Ma, Zhen Wang, Junzheng Wu, and Hua-Cheng Liu
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Health sciences ,Medicine ,Medical specialty ,Surgery ,Pharmacology ,Natural sciences ,Science - Abstract
Summary: There is currently no consensus on the optimal perioperative pain management strategy involving specific opioids. This study aims to compare the postoperative analgesia, the associated side effects between nalbuphine and morphine in children undergoing laparoscopic surgery. One hundred ninety children were randomly assigned to nalbuphine (0.2 mg/kg) or morphine (0.2 mg/kg). Nalbuphine’s analgesic effect was non-inferior to morphine, with similar total rescue analgesic consumption during PACU stay (0.03 ± 0.05mg vs. 0.04 ± 0.06 mg, p > 0.05). Nalbuphine group had a lower incidence of respiratory depression (RR ≤ 10/min) (4.8% vs. 38.6%, p
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- 2024
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3. Patient reported outcomes for quality of life (QOL) by Expanded Prostate Cancer Index (EPIC) on average 15 years post treatment
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Zachary A. Seymour, Stephanie Daignault-Newton, P.W. McLaughlin, Howard Sandler, William Jackson, Skyler B. Johnson, David Miller, John Wei, Martin Sanda, and Daniel A. Hamstra
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Medical physics. Medical radiology. Nuclear medicine ,R895-920 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Objective/purpose: Previously patient reported quality of life (QOL) was reported in men with prostate cancer a mean 2 and 6 years post treatment with open radical prostatectomy (RP), 3D conformal radiation therapy (3D CRT), or 125I low dose rate (LDR) brachytherapy (BT). Herein we update the results 15 years post-treatment QOL. Materials/methods: The Expanded Prostate Cancer Index (EPIC) domains were scored with differences evaluated at a median 15.8 years follow up based upon mean EPIC summary domains by ANOVA with pairwise post-hoc comparisons adjusted for age. Patient differences of current survey from first cross-section are reported as median change in summary score for each treatment group at median of 2.2 and 6.0, and 15.8 years. Results: Among men still alive response rate was 52% in BT, 60% in 3D CRT, and 62% in RP resulting in 30, 41, and 330 QOL questionnaires to evaluate for each corresponding modality at median follow up of 15.8 years. Men were a mean 75.3, 83.6, and 79.3 years of age after RP, 3DCRT, and BT, respectively.At a median of 15.8 years, there were largely persistent differences in EPIC domains without substantial evolution in QoL from middle time points. Persistent worsening in urinary irritative and bowel domain with 3DRT or BT compared to RP. Trend towards worse urinary incontinence with RP were noted without statistical differences within radiotherapy options. Conclusion: As the EPIC patient reported outcomes with the longest follow-up, these data uniquely reveal temporal trends from 2 to 15 years post treatment. However, the treatment modalities of open RP, 3D CRT without image guidance or intensity modulation, and BT without peripheral loading or MRI guidance may not reflect modern techniques.
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- 2022
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4. Genomic imbalances in the placenta are associated with poor fetal growth
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Giulia F. Del Gobbo, Yue Yin, Sanaa Choufani, Emma A. Butcher, John Wei, Evica Rajcan-Separovic, Hayley Bos, Peter von Dadelszen, Rosanna Weksberg, Wendy P. Robinson, and Ryan K. C. Yuen
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Aneuploidy ,Confined placental mosaicism ,Copy number variant ,Fetal growth restriction ,Placenta ,Pregnancy ,Therapeutics. Pharmacology ,RM1-950 ,Biochemistry ,QD415-436 - Abstract
Abstract Background Fetal growth restriction (FGR) is associated with increased risks for complications before, during, and after birth, in addition to risk of disease through to adulthood. Although placental insufficiency, failure to supply the fetus with adequate nutrients, underlies most cases of FGR, its causes are diverse and not fully understood. One of the few diagnosable causes of placental insufficiency in ongoing pregnancies is the presence of large chromosomal imbalances such as trisomy confined to the placenta; however, the impact of smaller copy number variants (CNVs) has not yet been adequately addressed. In this study, we confirm the importance of placental aneuploidy, and assess the potential contribution of CNVs to fetal growth. Methods We used molecular-cytogenetic approaches to identify aneuploidy in placentas from 101 infants born small-for-gestational age (SGA), typically used as a surrogate for FGR, and from 173 non-SGA controls from uncomplicated pregnancies. We confirmed aneuploidies and assessed mosaicism by microsatellite genotyping. We then profiled CNVs using high-resolution microarrays in a subset of 53 SGA and 61 control euploid placentas, and compared the load, impact, gene enrichment and clinical relevance of CNVs between groups. Candidate CNVs were confirmed using quantitative PCR. Results Aneuploidy was over tenfold more frequent in SGA-associated placentas compared to controls (11.9% vs. 1.1%; p = 0.0002, OR = 11.4, 95% CI 2.5–107.4), was confined to the placenta, and typically involved autosomes, whereas only sex chromosome abnormalities were observed in controls. We found no significant difference in CNV load or number of placental-expressed or imprinted genes in CNVs between SGA and controls, however, a rare and likely clinically-relevant germline CNV was identified in 5.7% of SGA cases. These CNVs involved candidate genes INHBB, HSD11B2, CTCF, and CSMD3. Conclusions We conclude that placental genomic imbalances at the cytogenetic and submicroscopic level may underlie up to ~ 18% of SGA cases in our population. This work contributes to the understanding of the underlying causes of placental insufficiency and FGR, which is important for counselling and prediction of long term outcomes for affected cases.
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- 2021
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5. Predicting individual knee range of motion, knee pain, and walking limitation outcomes following total knee arthroplasty
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Yong-Hao Pua, Cheryl Lian-Li Poon, Felicia Jie-Ting Seah, Julian Thumboo, Ross Allan Clark, Mann-Hong Tan, Hwei-Chi Chong, John Wei-Ming Tan, Eleanor Shu-Xian Chew, and Seng-Jin Yeo
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Orthopedic surgery ,RD701-811 - Abstract
Background and purpose — Up to 20% of patients are dissatisfied after total knee arthroplasty (TKA), mainly because of pain and restricted physical function. We developed a prediction model for 6-month knee range of motion, knee pain, and walking limitations in patients undergoing TKA surgery. Patients and methods — We performed a prospective cohort study of 4,026 patients who underwent elective, primary TKA between July 2013 and July 2017. Candidate predictors included demographic, clinical, psychosocial, and preoperative outcome measures. The outcomes of interest were (i) knee extension and flexion range of motion, (ii) knee pain rated on a 5-point ordinal scale, and (iii) self-reported maximum walk time at 6 months post TKA. For each outcome, we fitted a multivariable proportional odds regression model with bootstrap internal validation. Results — At 6 months post TKA, around 5% to 20% of patients had a flexion contracture ³ 10°, range of motion
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- 2019
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6. Mutual fund herding behavior and investment strategies in Chinese stock market
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John Wei-Shan Hu, Yen-Hsien Lee, and Ying-Chuang Chen
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Chinese stock market ,contrarian strategy ,herding behavior ,macroeconomic variables ,mutual fund ,Finance ,HG1-9999 - Abstract
This investigation studies the impact of mutual fund herding on the returns achieved by contrarian strategy from 1990 to 2015 in the Chinese stock market. The relationship between the profit gained by the contrarian strategy and the macroeconomic environment is also examined. First, the returns of the contrarian strategy in China’s stock market are found to be significant. Second, most loser stocks with a high degree of mutual fund herding outperform loser stocks with a low degree of mutual fund herding, revealing that the profitability of an investment portfolio depends on the degree of mutual fund herding. Third, investors should buy loser stocks with a high degree of herding and sell winner stocks with a low degree of herding during a two-year formation period, over which zero-cost contrarian strategies yield the significantly highest return. Finally, the payoff of contrarian strategies is positively related to the herding effect and negatively related to macroeconomic variables.
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- 2018
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7. Impact of IQ on the diagnostic yield of chromosomal microarray in a community sample of adults with schizophrenia
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Chelsea Lowther, Daniele Merico, Gregory Costain, Jack Waserman, Kerry Boyd, Abdul Noor, Marsha Speevak, Dimitri J. Stavropoulos, John Wei, Anath C. Lionel, Christian R. Marshall, Stephen W. Scherer, and Anne S. Bassett
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Schizophrenia ,Intellectual disability ,IQ ,Cognitive deficit ,Copy number variation ,Deletion ,Medicine ,Genetics ,QH426-470 - Abstract
Abstract Background Schizophrenia is a severe psychiatric disorder associated with IQ deficits. Rare copy number variations (CNVs) have been established to play an important role in the etiology of schizophrenia. Several of the large rare CNVs associated with schizophrenia have been shown to negatively affect IQ in population-based controls where no major neuropsychiatric disorder is reported. The aim of this study was to examine the diagnostic yield of microarray testing and the functional impact of genome-wide rare CNVs in a community ascertained cohort of adults with schizophrenia and low (
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- 2017
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8. Genome-wide copy number variant data for inflammatory bowel disease in a caucasian population
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Svetlana Frenkel, Charles N. Bernstein, Yong Won Jin, Michael Sargent, Qin Kuang, Wenxin Jiang, John Wei, Bhooma Thiruvahindrapuram, Stephen W. Scherer, and Pingzhao Hu
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Computer applications to medicine. Medical informatics ,R858-859.7 ,Science (General) ,Q1-390 - Abstract
Genome-wide copy-number association studies offer new opportunities to identify the mechanisms underlying complex diseases, including chronic inflammatory, psychiatric disorders and others. We have used genotyping microarrays to analyse the copy-number variants (CNVs) from 243 Caucasian individuals with Inflammatory Bowel Disease (IBD). The CNV data was obtained by using multiple quality control measures and merging the results of three different CNV detection algorithms: PennCNV, iPattern, and QuantiSNP. The final dataset contains 4,402 CNVs detected by two or three algorithms independently with high confidence. This paper provides a detailed description of the data generation and quality control steps. For further interpretation of the data presented in this article, please see the research article entitled ‘Copy number variation-based gene set analysis reveals cytokine signalling pathways associated with psychiatric comorbidity in patients with inflammatory bowel disease’.
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- 2019
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9. Genome-wide analysis identifies rare copy number variations associated with inflammatory bowel disease.
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Svetlana Frenkel, Charles N Bernstein, Michael Sargent, Qin Kuang, Wenxin Jiang, John Wei, Bhooma Thiruvahindrapuram, Elizabeth Spriggs, Stephen W Scherer, and Pingzhao Hu
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Medicine ,Science - Abstract
BackgroundInflammatory bowel disease (IBD) is an idiopathic, chronic disorder of unclear etiology with an underlying genetic predisposition. Recent genome-wide association studies have identified more than 200 IBD susceptibility loci, but the causes of IBD remain poorly defined. We hypothesized that rare (MethodsDNA samples from 243 individuals with IBD from the Manitoba IBD Cohort Study and 2988 healthy controls were analyzed using genome-wide SNP microarray technology. Three CNV calling algorithms were applied to maximize sensitivity and specificity of CNV detection. We identified IBD-associated genes affected by rare CNV from comparing the number of overlapping CNVs in IBD samples with the number of overlapping CNVs in controls for each gene.Results4,402 CNVs detected by two or three algorithms intersected 7,061 genes, in at least one analyzed sample. Four genes (e.g. DUSP22 and IP6K3) intersected by rare deletions and fourteen genes (e.g. SLC25A10, PSPN, GTF2F1) intersected by rare duplications demonstrated significant association with IBD (FDR-adjusted p-value < 0.01). Of these, ten genes were functionally related to immune response and intracellular signalling pathways. Some of these genes were also identified in other IBD related genome-wide association studies. These suggested that the identified genes may play a role in the risk of IBD.ConclusionOur results revealed new genomic loci associated with IBD, which suggested the role of rare CNVs in IBD risk.
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- 2019
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10. A Novel RNA In Situ Hybridization Assay for the Long Noncoding RNA SChLAP1 Predicts Poor Clinical Outcome After Radical Prostatectomy in Clinically Localized Prostate Cancer
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Rohit Mehra, Yang Shi, Aaron M. Udager, John R. Prensner, Anirban Sahu, Matthew K. Iyer, Javed Siddiqui, Xuhong Cao, John Wei, Hui Jiang, Felix Y. Feng, and Arul M. Chinnaiyan
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Long noncoding RNAs (lncRNAs) are an emerging class of oncogenic molecules implicated in a diverse range of human malignancies. We recently identified SChLAP1 as a novel lncRNA that demonstrates outlier expression in a subset of prostate cancers, promotes tumor cell invasion and metastasis, and associates with lethal disease. Based on these findings, we sought to develop an RNA in situ hybridization (ISH) assay for SChLAP1 to 1) investigate the spectrum of SChLAP1 expression from benign prostatic tissue to metastatic castration-resistant prostate cancer and 2) to determine whether SChLAP1 expression by ISH is associated with outcome after radical prostatectomy in patients with clinically localized disease. The results from our current study demonstrate that SChLAP1 expression increases with prostate cancer progression, and high SChLAP1 expression by ISH is associated with poor outcome after radical prostatectomy in patients with clinically localized prostate cancer by both univariate (hazard ratio = 2.343, P = .005) and multivariate (hazard ratio = 1.99, P = .032) Cox regression analyses. This study highlights a potential clinical utility for SChLAP1 ISH as a novel tissue-based biomarker assay for outcome prognostication after radical prostatectomy.
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- 2014
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11. Multiple Criteria Decision Making and General Regression for Determining Influential Factors on S&P 500 Index Futures
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John Wei-Shan Hu, Yi-Chung Hu, and Amber Chia-Hua Tsai
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DEMATEL ,analytic network process ,grey relational analysis ,general regression ,MCDM ,S& ,P 500 index futures ,US dollar index ,Mathematics ,QA1-939 - Abstract
We employ the DEMATEL-based analytic network process (D-ANP) to evaluate the weight of various factors on S&P 500 index futures. The general regression method is employed to prove the result. We then employed grey relational analysis (GRA) to examine predictive power of determinants suggested by 13 experts for fluctuations in S&P 500 index futures. This study yields a number of empirical results. (1) The explanatory power of macroeconomic factors for S&P 500 index futures outperforms that of technical indicators, as found in most of previous research papers; (2) The D-ANP revealed that five core factors (US dollar index, ISM manufacturing purchasing managers’ index (PMI), interest rate, volatility index, and unemployment rate) affect fluctuations in S&P 500 index futures, of which the US dollar index is the most important; (3) A casual diagram shows that the US dollar index and interest rate have mutual effects, and the US dollar index unilaterally affects ISM manufacturing PMI, unemployment rate, and the volatility index; (4) Granger causality test results confirmed some similar results obtained via the D-ANP that the US dollar index, interest rate, and the PMI have major impacts on the S&P 500 index futures; (5) The general regression results confirmed that four of five factors selected via the D-ANP (US dollar index, interest rate, volatility index, and unemployment rate) have strong explanatory power in forecasting the rate of return on S&P 500 index futures; (6) The GRA revealed that the explanatory power of various factors selected via the D-ANP was better for S&P 500 than for Dow Jones Industrial Average (DJIA) and Nasdaq 100 index futures; (7) The explanatory power is better for S&P 500 Industrial than for S&P 500 transportation, utility, and financial index futures.
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- 2017
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12. Queer encounters between Iron Man and Chinese boys' love fandom
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John Wei
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BL ,Cyborg ,Fan fiction ,Film ,Superhero ,Yaoi ,Communication. Mass media ,P87-96 - Abstract
Superhero fan fiction is increasingly popular in the Chinese boys' love (BL) community. An exploration of the fan fic Gangtiexia: Zhongdu Yilai (Iron Man: Overly attached) investigates how the Hollywood cultural icon Iron Man/Tony Stark is reimagined in Chinese BL culture and to what degree this kind of rendition both echoes and extends as well as challenges and deviates from our current insights into BL fandoms. Through the lenses of queerness and technological human transformation, I explore the fresh contribution of Iron Man fan fiction to both local BL cultures and global superhero fandoms.
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- 2014
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13. Effect of Temperature Shock and Inventory Surprises on Natural Gas and Heating Oil Futures Returns
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John Wei-Shan Hu, Yi-Chung Hu, and Chien-Yu Lin
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Technology ,Medicine ,Science - Abstract
The aim of this paper is to examine the impact of temperature shock on both near-month and far-month natural gas and heating oil futures returns by extending the weather and storage models of the previous study. Several notable findings from the empirical studies are presented. First, the expected temperature shock significantly and positively affects both the near-month and far-month natural gas and heating oil futures returns. Next, significant temperature shock has effect on both the conditional mean and volatility of natural gas and heating oil prices. The results indicate that expected inventory surprises significantly and negatively affects the far-month natural gas futures returns. Moreover, volatility of natural gas futures returns is higher on Thursdays and that of near-month heating oil futures returns is higher on Wednesdays than other days. Finally, it is found that storage announcement for natural gas significantly affects near-month and far-month natural gas futures returns. Furthermore, both natural gas and heating oil futures returns are affected more by the weighted average temperature reported by multiple weather reporting stations than that reported by a single weather reporting station.
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- 2014
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14. Isoflavones, genistein and daidzein, regulate mucosal immune response by suppressing dendritic cell function.
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John Wei, Shiven Bhatt, Lisa M Chang, Hugh A Sampson, and Madhan Masilamani
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Medicine ,Science - Abstract
Lipopolysaccharide (LPS), a component of gram-negative bacterial cell walls, has been shown to have a strong adjuvant effect towards inhaled antigens contributing to airway inflammation. Isoflavones are anti-inflammatory molecules present in abundant quantities in soybeans. We investigated the effect of isoflavones on human dendritic cell (DC) activation via LPS stimulation and subsequent DC-mediated effector cell function both in vitro and in a mouse model of upper airway inflammation. Human monocyte-derived DCs (MDDC) were matured with LPS (or TNF-α) +/- isoflavones (genistein or daidzein). The surface expression levels of DC activation markers were analyzed by flow cytometry. Mature DCs +/- isoflavones were washed and cultured with freshly-isolated allogenic naïve CD4⁺ T cells for 5 days or with autologous natural killer (NK) cells for 2 hours. The percentages of proliferating IFN-γ⁺ CD4⁺ T cells and cytokine levels in culture supernatants were assessed. NK cell degranulation and DC cytotoxicity were measured by flow cytometry. Isoflavones significantly suppressed the activation-induced expression of DC maturation markers (CD83, CD80, CD86) and MHC class I but not MHC class II molecules in vitro. Isoflavone treatment inhibited the ability of LPS-DCs to induce IFN-γ in CD4⁺ T cells. NK cell degranulation and the percentage of dead DCs were significantly increased in isoflavone-treated DC-NK co-culture experiments. Dietary isoflavones suppressed the mucosal immune response to intra-nasal sensitization of mice to ovalbumin. Similar results were obtained when isoflavones were co-administered during sensitization. These results demonstrate that soybean isoflavones suppress immune sensitization by suppressing DC-maturation and its subsequent DC-mediated effector cell functions.
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- 2012
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15. Comparison of postoperative analgesia and side effects in pediatric laparoscopic surgery with morphine and nalbuphine
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Chen, Jia, Wang, Cheng-Yu, Zhong, John Wei, Cai, Yu-Hang, Zhang, Jianmin, Wang, Fang, Zhang, Mazhong, Gu, Hongbin, Ma, Hong-Yu, Wang, Zhen, Wu, Junzheng, and Liu, Hua-Cheng
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- 2024
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16. Feasibility, reliability and validity of self-measurement of knee range-of-motion using an accelerometer-based smartphone application by patients with total knee arthroplasty.
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Chew, Eleanor Shuxian, Woon, Ee-Lin, Miao-Shi Low, Juanita Krysten, Haseler, Luke Jonathan, Ismail, Ismahfaris, Alif, Muhammad Bukhari, Kwan, Yu-Heng, Tan, John Wei-Ming, Koh, Samantha Shi-Man, Pang, Hee-Nee, Chen, Jerry Delphi Yongqiang, Yeo, Seng-Jin, Lim, Shi-Ying, Tan, Celia Ia-Choo, and Pua, Yong-Hao
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TOTAL knee replacement ,INTRACLASS correlation ,MOBILE apps ,MEDICAL personnel ,MOBILE health ,KNEE - Abstract
Aims: Limited knee range-of-motion (ROM) is common following total knee arthroplasty (TKA). It is associated with functional limitations and patient dissatisfaction. Regular knee ROM assessment is important but accurate testing traditionally requires timely access to trained healthcare professionals. Although accelerometer-based smartphone goniometry has shown to provide reliable and valid joint angles, current evidence of its use still positions healthcare providers as end users instead of patients themselves. Therefore, to maximize the impact of smartphone goniometry on post-TKA care, our study aimed to examine the feasibility, reliability, and validity of patients' self-measurement of knee ROM using an accelerometer-based smartphone goniometry application. Methods: Patients were given standard instructions with a practice trial before the actual measurements. Passive knee flexion and extension ROM was measured on 2 sessions in 30 patients with TKA using 4 block-randomized methods: (i) smartphone self-assessment, (ii) long-arm goniometry by physiotherapist, (iii) smartphone assessment by physiotherapist, and (iv) extendable-arm goniometry by physiotherapist with placement adjudication. Feasibility was assessed by the number of participants who could independently perform the self-measurement. To assess intra- and inter-session reliability, we computed intraclass correlation coefficients (ICCs) from random-effects models. To assess intra- and inter-session agreement, we computed mean absolute differences (MADs) and minimum detectable change (MDC). To assess concurrent validity, we designated extendable-arm goniometry as the "gold standard" and compared other methods against it using ICCs and MADs. Results: All patients were able to comprehend and execute the assessment. 87% (n = 26) found the application easy to administer. Smartphone goniometry by patients showed excellent intra- and inter-session reliability (ICCs>0.97) and minimum variability (MAD = 0.9°-3.9°; MDC
95 = 3.1°–9.0°). Smartphone or long-arm goniometry by physiotherapists did not outperform patients' self-assessment (ICC = 0.96–0.99, MAD = 0.7°-3.1°; MDC95 = 2.2°-8.0°). Compared against extendable-arm goniometry, smartphone goniometry by patients measured knee flexion and extension ROM with a MAD of 4.5° (ICC, 0.97) and 2.2° (ICC = 0.98), respectively. Conclusion: Our study demonstrates that smartphone goniometry is feasible, reliable and accurate, and can be used with confidence in the self-assessment of knee ROM post-TKA. Future studies should further explore its utility in telemonitored rehabilitation, and its possible integration into mobile health applications to enhance accessibility to care following TKA. [ABSTRACT FROM AUTHOR]- Published
- 2024
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17. Replicating and Digesting Anomalies in the Chinese A-Share Market.
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Li, Zhibing, Liu, Laura Xiaolei, Liu, Xiaoyu, and John Wei, K. C.
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INTERNATIONAL Financial Reporting Standards ,BUSINESS schools ,EDUCATIONAL finance ,ECONOMIC research ,ACCOUNTING standards - Abstract
We replicate 469 anomaly variables similar to those studied by Hou et al. (2020) using Chinese A-share data and a reliable testing procedure with mainboard breakpoints and value-weighted returns. We find that 83.37% of the anomaly variables do not generate significant high-minus-low quintile raw return spreads. Further adjusting risk increases the failure rate slightly to 84.22% based on CAPM alphas and 86.99% based on Fama–French three-factor alphas. We show that the conventional procedure using all A-share breakpoints with equal-weighted returns for the anomaly test is indeed problematic as it assigns too much weight to microcaps and has a very limited investment capacity. The CH3-factor, CH4-factor, and q-factor models show the best performance over the whole sample period. The q-factor model is the best performer in the post-2007 subsample period after significant improvements occurred in China's financial market environment, such as the completion of the split-share structure reform and the implementation of new accounting standards conforming to the International Financial Reporting Standards. The non–state-owned enterprise subsample in the post-2007 period is a cleaner sample in which the CH4-factor and q-factor models are the best performers. This paper was accepted by Lukas Schmid, finance. Funding: Z. Li acknowledges financial support from the National Natural Science Foundation of China [Grant 72103043] and the Fundamental Research Funds for the Central Universities in UIBE [Grants 19QN01 and 22PY053-72103043]. L. X. Liu acknowledges financial support from the National Natural Science Foundation of China [Grants 71872006 and 72273006]. L. X. Liu and X. Liu acknowledge financial support from the Guanghua Thought Leadership Platform of Peking University. K. C. J. Wei acknowledges partial financial support from the Research Grants Council of the Hong Kong Special Administrative Region, China [Grant 15507320]. The authors acknowledge financial support from the Guanghua School of Management, Peking University; the School of Banking and Finance, University of International Business and Economics; and the Non-PAIR Research Centre "Research Centre for Quantitative Finance" at Hong Kong Polytechnic University. Supplemental Material: The online appendix and data are available at https://doi.org/10.1287/mnsc.2023.4904. [ABSTRACT FROM AUTHOR]
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- 2024
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18. Replicating and Digesting Anomalies in the Chinese A-Share Market
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Li, Zhibing, primary, Liu, Laura Xiaolei, additional, Liu, Xiaoyu, additional, and John Wei, K. C., additional
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- 2023
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19. Long-Term Shareholder Returns: Evidence from 64,000 Global Stocks
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Hendrik Bessembinder, Goeun Choi, K.C. John Wei, and Te-Feng Chen
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History ,Economics and Econometrics ,Polymers and Plastics ,Monetary economics ,Full sample ,Industrial and Manufacturing Engineering ,Treasury ,Term (time) ,Shareholder ,Accounting ,Common stock ,National wealth ,Stock market ,Business ,Business and International Management ,Finance - Abstract
We study long-run shareholder outcomes for over 64,000 global common stocks during the January 1990 to December 2020 period. We document that the majority, 55.2% of U.S. stocks and 57.4% of non-U.S. stocks, underperform one-month U.S. Treasury bills in terms of compound returns over the full sample. Focusing on aggregate shareholder outcomes, we find that the top-performing 2.4% of firms account for all of the $US 75.7 trillion in net global stock market wealth creation from 1990 to December 2020. Outside the US, 1.41% of firms account for the $US 30.7 trillion in net wealth creation.
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- 2023
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20. Taiwan's Same-Sex Marriage Legislation: Social Movement Strategies and Relational Dynamics
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John Wei
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Economics and Econometrics ,Sociology and Political Science ,Political Science and International Relations ,Development - Abstract
In 2019, Taiwan became the first in Asia to legalize same-sex marriage (SSM). This article considers the social movement strategies and relational dynamics of three activist groups in the year leading to the landmark SSM legislation, respectively representing the “yes,” “no,” and “alternative” agendas in the public debates and social mobilization around the issue of equal marriage rights. Through a critical study of the three cases, this article examines how various campaigners shaped local SSM discourses and mobilized people to support, oppose, and question marriage equality, focusing on their social mobilization strategies and inter-group relational dynamics under Taiwan's political and legal structures. In so doing, it proposes a hybrid theoretical model to understand complex social movement and countermovement relations and dynamics.
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- 2023
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21. Gene copy number variation and pediatric mental health/neurodevelopment in a general population
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Mehdi Zarrei, Christie L Burton, Worrawat Engchuan, Edward J Higginbotham, John Wei, Sabah Shaikh, Nicole M Roslin, Jeffrey R MacDonald, Giovanna Pellecchia, Thomas Nalpathamkalam, Sylvia Lamoureux, Roozbeh Manshaei, Jennifer Howe, Brett Trost, Bhooma Thiruvahindrapuram, Christian R Marshall, Ryan K C Yuen, Richard F Wintle, Lisa J Strug, Dimitri J Stavropoulos, Jacob A S Vorstman, Paul Arnold, Daniele Merico, Marc Woodbury-Smith, Jennifer Crosbie, Russell J Schachar, and Stephen W Scherer
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Genetics ,General Medicine ,Molecular Biology ,Genetics (clinical) - Abstract
We assessed the relationship of gene copy number variation (CNV) in mental health/neurodevelopmental traits and diagnoses, physical health and cognition in a community sample of 7100 unrelated children and youth of European or East Asian ancestry (Spit for Science). Clinically significant or susceptibility CNVs were present in 3.9% of participants and were associated with elevated scores on a continuous measure of attention-deficit/hyperactivity disorder (ADHD) traits (P = 5.0 × 10−3), longer response inhibition (a cognitive deficit found in several mental health and neurodevelopmental disorders; P = 1.0 × 10−2) and increased prevalence of mental health diagnoses (P = 1.9 × 10−6, odds ratio: 3.09), specifically ADHD, autism spectrum disorder anxiety and learning problems/learning disorder (P’s
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- 2023
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22. Rethinking Queer (Asian) Studies: Geopolitics, Covid-19, and Post-Covid Queer Theories and Mobilities
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John Wei
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Gender Studies ,Social Psychology ,General Medicine ,General Psychology ,Education - Abstract
This paper considers queer studies in the global geopolitical hotspot of Asia, as well as how we can reimagine queer theories through both the Covid-19 pandemic and the intensified regional and global superpower competition and geopolitical tensions. It argues for a rethinking of queer studies through today’s international relations and geopolitical complications in a sociological political economy. The aim is to connect critical studies with analyses of economic and social class structures, an approach that has been substantiated by the current crises, and to present an expanded queer mobility theory with two brief case studies (mini-critiques) of the current socioeconomic conditions facing marginalized people under Covid-19 and the changing geopolitical landscape. In so doing, this paper actively explores what queer studies can do and can be through the current historical turning point of the pandemic and geopolitical rivalry towards potential post-Covid socioeconomic revival and recovery.
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- 2023
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23. Chinese and Global ADRs: The US Investor Experience
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Goeun Choi, K.C. John Wei, Hendrik Bessembinder, and Te-Feng Chen
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Receipt ,Economics and Econometrics ,Actuarial science ,Accounting ,Business ,Finance - Abstract
We study outcomes to ADR (American Depositary Receipt) investments between August 1954 and September 2020, with particular attention to ADRs associated with Chinese firms. Overall, ADRs improved in...
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- 2021
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24. The modular approach to therapy for youths with anxiety, depression, trauma, and conduct problems (MATCH): results from the Norwegian randomized-controlled trial
- Author
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Silje S. Hukkelberg, Torbjørn Torsheim, Kristin Berg Nordahl, Görel E. Bringedal, Sivarajan Rajah, Kristine Amlund Hagen, John Kjøbli, Kristian Rognstad, Ana M. Ugueto, Sarah Kate Bearman, and John Weisz
- Subjects
Effectiveness study ,Modular approach ,Youths ,Externalizing and internalizing problems ,Evidence-based treatment ,Adherence to therapy ,Psychology ,BF1-990 - Abstract
Abstract Background A randomized controlled trial was conducted to examine the effectiveness of the Modular Approach to Therapy for Youths with Anxiety, Depression, Trauma, and Conduct Problems (MATCH) for Norwegian youths referred to seven Child and Adolescent Psychiatric Outpatient Clinics. MATCH addresses comorbid problems that are common in children and youth, and its transdiagnostic design may therefore be more effective compared to standard treatments that often address single problems. MATCH has, however, never been evaluated in a Nordic context, and the present study aimed to fill this gap. Methods A sample of 121 Norwegian youths (M age = 9.83, 58.7% boys) was randomly assigned to MATCH (n = 73) or treatment as usual (TAU, n = 48). Primary treatment outcomes were youths’ externalizing and internalizing problems as reported by parents, using the Child Behavior Checklist, the Behavior and Feelings Survey. In addition, the study included assessments of parent-reported Top Problems. Results Overall, youths showed significant improvements in both externalizing and internalizing problems from intake to post-test. Results did not provide evidence that MATCH reduces symptoms of these problems compared to TAU. Conclusions The findings were inconclusive regarding whether MATCH was more effective than TAU in reducing youth internalizing and externalizing problems. Trial Registration Identifier ISRCTN24029895. Registration date: 8/8/2016.
- Published
- 2024
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25. Age- and sex-based recovery curves to track functional outcomes in older adults with total knee arthroplasty
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Pua, Yong-Hao, Seah, Felicia Jie-Ting, Poon, Cheryl Lian-Li, Tan, John Wei-Ming, Alan Clark, Ross, Liaw, Jennifer Suet-Ching, and Chong, Hwei-Chi
- Published
- 2018
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- View/download PDF
26. Pre-Conditioning Easix Is Associated with Survival after Autologous Hematopoietic Stem Cell Transplant in Mature T-Cell Lymphomas
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Daniel K. Reef, John Wei, Alyssa De Castro, Felisha Joseph, Kailyn Gillick, Jennat Mustafa, Fariha Khatun, Amanda Lombardo, Latoya Townsend Nugent, Michelly Abreu, Nicole Chambers, Richard Elkind, Yang Shi, Yanhua Wang, Olga Derman, Kira Gritsman, Ulrich G. Steidl, Mendel Goldfinger, Noah Kornblum, Aditi Shastri, Ioannis Mantzaris, Lizamarie Bachier-Rodriguez, Nishi Shah, Marina Konopleva, Dennis Cooper, Ira Braunschweig, Amit Verma, and R. Alejandro Sica
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Immunology ,Cell Biology ,Hematology ,Biochemistry - Published
- 2022
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27. MyProstateScore in Men Considering Repeat Biopsy: Validation of a Simple Testing Approach
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Jeffrey Tosoian, Michael Sessine, Bruce Trock, Ashley Ross, Cassie Xie, Yingye Zheng, Nathan Samora, Javed Siddiqui, Yashar Niknafs, Zoey Chopra, Scott Tomlins, Lakshmi Kunju, Ganesh Palapattu, Todd Morgan, John Wei, Simpa Salami, and Arul Chinnaiyan
- Abstract
Background: Men with persistent risk of Grade Group (GG) ≥2 cancer after a negative biopsy present a unique clinical challenge. The validated MyProstateScore test is clinically-available for pre-biopsy risk stratification. In biopsy-naïve patients, we recently validated a straightforward testing approach to rule out GG≥2 cancer with 98% negative predictive value (NPV) and 97% sensitivity. We sought to establish a practical MPS-based testing approach in men with a previous negative biopsy being considered for repeat biopsy. Methods: Patients provided post-digital rectal examination urine prior to repeat biopsy. MyProstateScore was calculated using the validated, locked model including urinary PCA3 and TMPRSS2:ERG scores with serum PSA. In a clinically-appropriate training cohort, we identified a lower (rule-out) threshold approximating 90% sensitivity and an upper (rule-in) threshold approximating 80% specificity for GG≥2 cancer. These thresholds were applied to an external validation cohort, and performance measures and clinical outcomes associated with their use were calculated.Results: MyProstateScore thresholds of 15 and 40 met pre-defined performance criteria in the training cohort (422 patients; median PSA 6.4, IQR 4.3-9.1). In the 268-patient validation cohort, 25 men (9.3%) had GG≥2 cancer on repeat biopsy. The rule-out threshold of 15 provided 100% NPV and sensitivity for GG≥2 cancer and would have prevented 23% of unnecessary biopsies. Use of MyProstateScore >40 to rule-in biopsy would have prevented 67% of biopsies while maintaining 95% NPV. The prevalence of GG≥2 cancer was 0% for MyProstateScore 0-15, 6.5% for MyProstateScore 15-40, and 19% for MyProstateScore >40.Conclusions: In patients who previously underwent a negative prostate biopsy, the MyProstateScore values of 15 and 40 yielded clinically-actionable rule-in and rule-out risk groups. Using this straightforward testing approach, MyProstateScore can meaningfully inform patients and physicians weighing the need for repeat biopsy.
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- 2022
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28. Epidemiology of norovirus disease in the first 2 years of life: A prospective multisite cohort study in Lima, Peru
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Claudio F. Lanata, Giselle Soto, Ana I. Gil, Joan Neyra, Rubelio Cornejo, Candice Romero, Lucie Ecker, Maria L. Huaylinos, Sayda La Rosa, Ana Goios, Astrid Borkowski, and John Weil
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Norovirus ,Epidemiology ,Coinfection ,Children ,Peru ,Infectious and parasitic diseases ,RC109-216 - Abstract
Objectives: Norovirus is associated with 18% of acute gastroenteritis (AGE) cases worldwide. We aim to document the norovirus-related AGE incidence in peri-urban areas of Lima (Peru), evaluating the potential impact of a norovirus vaccine introduction. Methods: A prospective, community-based pediatric cohort study was established at two sites in Lima. Healthy children between 5 and 18 months were contacted weekly for AGE detection during a 6-month period. Stool samples from AGE cases were tested for norovirus by RT-PCR. Incidence and coinfection of norovirus-associated AGE were analyzed. All norovirus-positive samples were genotyped by Sanger DNA sequencing. Results: Among 498 enrolled children, 461 (93%) completed the follow-up period. We detected 799 AGE cases, yielding 676 valid stool samples. Norovirus was detected in 216 samples (32%), with an incidence of 7.7 episodes per 100 child-months (95% CI: 6.7-8.8). Genotypes GII.4 (31%) and GII.6 (22%) were frequent. Campylobacter (43%) and Salmonella spp. (15%) were the most common coinfections with norovirus. Ninety-five percent of study children had received an oral rotavirus vaccine. Conclusion: Norovirus was the second most frequent cause of AGE in this Peruvian cohort with high rotavirus vaccine coverage. An effective norovirus vaccine would have an important public health benefit in this population.
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- 2025
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29. Leveraging digital medication adherence technologies to enhance sustainability of European health systems: ENABLE’s key recommendations
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Job F.M. van Boven, Alexandra L. Dima, Björn Wettermark, Ines Potočnjak, Tamás Ágh, Emma Aarnio, Maria Achterbosch, Nilay Aksoy, Martina Bago, Pilar Barnestein-Fonseca, Noemi Bitterman, Michel Burnier, Edel Burton, Theodosia Charitou, Maria Cordina, Tinne Dilles, Klemen Dovc, Marie Ekenberg, Monique Elseviers, Válter R. Fonseca, Sabina de Geest, Cristina M. Ghiciuc, Catherine Goetzinger, Hanna Gottlieb, Anne-Gerd Granas, João Gregório, Gaye Hafez, Kjeld Hansen, Frederik Haupenthal, Rob Heerdink, Maria Teresa Herdeiro, Mickaël Hiligsmann, Dalma Hosszú, Cristina Jacome, Fatjona Kamberi, Maria Kamusheva, Anthony Karageorgos, Przemyslaw Kardas, Nataliia Khanyk, Sandrine Lavalle, Francisca Leiva Fernández, Carlotta Lunghi, Enrica Menditto, Jovan Mihajlovic, Iva Mucalo, Sara Mucherino, Urska Nabergoj Makovec, Anna Oleárová, Maja Ortner Hadžiabdić, Christos Petrou, Ana Tomas Petrovic, Guenka Petrova, Hilary Pinnock, Elisabetta Poluzzi, Miriam Qvarnström, Pamela Rackow, Janette Ribaut, Fatima Roque, Laura J. Sahm, Marie Paule Schneider, Katarina Smilkov, Dins Smits, Ivana Tadic, Indrė Trečiokienė, Ioanna Tsiligianni, Katia Vermeire, Marcia Vervloet, Jiří Vlček, Shlomo Vinker, Daisy Volmer, Bernard Vrijens, and John Weinman
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Public aspects of medicine ,RA1-1270 - Published
- 2025
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30. Genomic imbalances in the placenta are associated with poor fetal growth
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John Wei, Peter von Dadelszen, Ryan K. C. Yuen, Giulia F. Del Gobbo, Rosanna Weksberg, Yue Yin, Sanaa Choufani, Emma A. Butcher, Evica Rajcan-Separovic, Wendy P. Robinson, and Hayley Bos
- Subjects
Male ,0301 basic medicine ,Candidate gene ,Genotyping Techniques ,Placenta ,Aneuploidy ,Intrauterine growth restriction ,Trisomy ,Bioinformatics ,Copy number variant ,0302 clinical medicine ,Pregnancy ,lcsh:QD415-436 ,Confined placental mosaicism ,Genetics (clinical) ,Oligonucleotide Array Sequence Analysis ,education.field_of_study ,Fetal Growth Retardation ,030219 obstetrics & reproductive medicine ,Mosaicism ,Fetal growth restriction ,3. Good health ,medicine.anatomical_structure ,Cytogenetic Analysis ,Infant, Small for Gestational Age ,Molecular Medicine ,Female ,Microsatellite Instability ,Research Article ,DNA Copy Number Variations ,Population ,Placental insufficiency ,Biology ,lcsh:Biochemistry ,Genomic Imprinting ,03 medical and health sciences ,Genetics ,medicine ,Humans ,education ,Molecular Biology ,Small-for-gestational age ,lcsh:RM1-950 ,Infant, Newborn ,medicine.disease ,030104 developmental biology ,lcsh:Therapeutics. Pharmacology ,Case-Control Studies - Abstract
Background Fetal growth restriction (FGR) is associated with increased risks for complications before, during, and after birth, in addition to risk of disease through to adulthood. Although placental insufficiency, failure to supply the fetus with adequate nutrients, underlies most cases of FGR, its causes are diverse and not fully understood. One of the few diagnosable causes of placental insufficiency in ongoing pregnancies is the presence of large chromosomal imbalances such as trisomy confined to the placenta; however, the impact of smaller copy number variants (CNVs) has not yet been adequately addressed. In this study, we confirm the importance of placental aneuploidy, and assess the potential contribution of CNVs to fetal growth. Methods We used molecular-cytogenetic approaches to identify aneuploidy in placentas from 101 infants born small-for-gestational age (SGA), typically used as a surrogate for FGR, and from 173 non-SGA controls from uncomplicated pregnancies. We confirmed aneuploidies and assessed mosaicism by microsatellite genotyping. We then profiled CNVs using high-resolution microarrays in a subset of 53 SGA and 61 control euploid placentas, and compared the load, impact, gene enrichment and clinical relevance of CNVs between groups. Candidate CNVs were confirmed using quantitative PCR. Results Aneuploidy was over tenfold more frequent in SGA-associated placentas compared to controls (11.9% vs. 1.1%; p = 0.0002, OR = 11.4, 95% CI 2.5–107.4), was confined to the placenta, and typically involved autosomes, whereas only sex chromosome abnormalities were observed in controls. We found no significant difference in CNV load or number of placental-expressed or imprinted genes in CNVs between SGA and controls, however, a rare and likely clinically-relevant germline CNV was identified in 5.7% of SGA cases. These CNVs involved candidate genes INHBB, HSD11B2, CTCF, and CSMD3. Conclusions We conclude that placental genomic imbalances at the cytogenetic and submicroscopic level may underlie up to ~ 18% of SGA cases in our population. This work contributes to the understanding of the underlying causes of placental insufficiency and FGR, which is important for counselling and prediction of long term outcomes for affected cases.
- Published
- 2021
31. Dynamic correlation and hedging ability of precious metals in pre- and post-COVID periods
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Hamdan Bukenya Ntare, John Weirstrass Muteba Mwamba, and Franck Adekambi
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t-copula-DCC-GJR-GARCH-skew-t ,R-vine copula ,dynamic hedge ratios ,dynamic portfolio weights ,C13•C51•C58•G11 ,Economics ,Finance ,HG1-9999 ,Economic theory. Demography ,HB1-3840 - Abstract
This study examines the dynamic correlations and hedge ratios of precious metal stock returns of the Johannesburg stock exchange in pre- and post-COVID scenarios to determine if they can be used to hedge against adverse market movements. The study uses daily return series of four gold stocks and three platinum stocks listed on the Johannesburg Stock Exchange (JSE) spanning from 11 November 2016 to 31 December 2019, for the pre-COVID period and 02 January 2020 to 10 February 2023, for the post-COVID period. Using t-copula-DCC-GJR-GARCH-skew-t and t-copula-aDCC-GJR-GARCH-skew-t models for pre- and post-COVID periods, respectively and the R-vine copula model for tail dependence analysis during times of extreme market conditions; our findings show that gold stocks are better hedge assets than platinum stocks during downturn market. Further, dynamic hedge ratios show that it is more expensive to hedge against long positions in the JSE index in the pre-COVID period than in the post-COVID period. Hedging effectiveness demonstrates that the dynamic portfolio weights strategy is better than hedge ratios when hedging against the JSE index. Based on the findings in this study, the economy of South Africa could possibly benefit if the government and the private sector reinvigorate the precious metal mining sector.
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- 2024
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32. CEO Expertise and the Design of Compensation Contracts: Evidence from Generalist versus Specialist CEOs
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K.C. John Wei, Wei Shi, and Chunbo Liu
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Information asymmetry ,Actuarial science ,ComputingMilieux_THECOMPUTINGPROFESSION ,Accounting ,Compensation (psychology) ,Adverse selection ,ComputingMilieux_LEGALASPECTSOFCOMPUTING ,Business ,Business and International Management ,Generalist and specialist species - Abstract
Generalist CEOs receive higher pay than specialist CEOs. We examine the implications of CEO expertise for the structure of executive compensation. We follow contract theory and predict that information asymmetry induces generalist CEOs to overstate their ability to a larger extent when contracting with shareholders. Boards of directors take this into account by designing compensation contracts that link their pay more closely to firm performance. Our empirical results support this prediction, and the link is more pronounced when generalist CEOs are less known in the executive labor market or are hired externally. The results hold after we control for a battery of factors that potentially affect incentive pay, including firm characteristics and CEO ability. Overall, our results support the optimal contracting perspective of executive compensation and highlight the importance of CEO expertise generality in resolving adverse selection during the contracting process. JEL Classifications: G34; J24; J33.
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- 2020
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33. Security analysts and capital market anomalies
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Li Guo, K.C. John Wei, and Frank Weikai Li
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040101 forestry ,Economics and Econometrics ,050208 finance ,Strategy and Management ,Anomaly (natural sciences) ,05 social sciences ,Market efficiency ,04 agricultural and veterinary sciences ,Monetary economics ,Accounting ,0502 economics and business ,Value (economics) ,Economics ,0401 agriculture, forestry, and fisheries ,Frictionless market ,Capital market ,Finance - Abstract
We examine the value and efficiency of analyst recommendations through the lens of capital market anomalies. We find that analysts do not fully use the information in anomaly signals when making recommendations. Specifically, analysts tend to give more favorable consensus recommendations to stocks classified as overvalued, and, more importantly, these stocks subsequently tend to have particularly negative abnormal returns. Analysts whose recommendations are better aligned with anomaly signals are more skilled and elicit stronger recommendation announcement returns. Our findings suggest that analysts’ biased recommendations could be a source of market friction that impedes the efficient correction of mispricing.
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- 2020
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34. Continuous Positive Airway Pressure as a Tool of Perioperative Management of Patients with Sleep Disorders
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John Wei Zhong, Tiberiu Ezri, Alexander Dukhan, and Peter Szmuk
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Sleep Wake Disorders ,Anesthesiology and Pain Medicine ,Parasomnias ,Continuous Positive Airway Pressure ,Restless Legs Syndrome ,Sleep Initiation and Maintenance Disorders ,Humans ,Narcolepsy - Published
- 2022
35. Continuous Positive Airway Pressure as a Tool of Perioperative Management of Patients with Sleep Disorders
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Zhong, John Wei, primary, Ezri, Tiberiu, additional, Dukhan, Alexander, additional, and Szmuk, Peter, additional
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- 2022
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36. Genomic architecture of autism from comprehensive whole-genome sequence annotation
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Brett Trost, Bhooma Thiruvahindrapuram, Ada J.S. Chan, Worrawat Engchuan, Edward J. Higginbotham, Jennifer L. Howe, Livia O. Loureiro, Miriam S. Reuter, Delnaz Roshandel, Joe Whitney, Mehdi Zarrei, Matthew Bookman, Cherith Somerville, Rulan Shaath, Mona Abdi, Elbay Aliyev, Rohan V. Patel, Thomas Nalpathamkalam, Giovanna Pellecchia, Omar Hamdan, Gaganjot Kaur, Zhuozhi Wang, Jeffrey R. MacDonald, John Wei, Wilson W.L. Sung, Sylvia Lamoureux, Ny Hoang, Thanuja Selvanayagam, Nicole Deflaux, Melissa Geng, Siavash Ghaffari, John Bates, Edwin J. Young, Qiliang Ding, Carole Shum, Lia D'Abate, Clarrisa A. Bradley, Annabel Rutherford, Vernie Aguda, Beverly Apresto, Nan Chen, Sachin Desai, Xiaoyan Du, Matthew L.Y. Fong, Sanjeev Pullenayegum, Kozue Samler, Ting Wang, Karen Ho, Tara Paton, Sergio L. Pereira, Jo-Anne Herbrick, Richard F. Wintle, Jonathan Fuerth, Juti Noppornpitak, Heather Ward, Patrick Magee, Ayman Al Baz, Usanthan Kajendirarajah, Sharvari Kapadia, Jim Vlasblom, Monica Valluri, Joseph Green, Vicki Seifer, Morgan Quirbach, Olivia Rennie, Elizabeth Kelley, Nina Masjedi, Catherine Lord, Michael J. Szego, Ma'n H. Zawati, Michael Lang, Lisa J. Strug, Christian R. Marshall, Gregory Costain, Kristina Calli, Alana Iaboni, Afiqah Yusuf, Patricia Ambrozewicz, Louise Gallagher, David G. Amaral, Jessica Brian, Mayada Elsabbagh, Stelios Georgiades, Daniel S. Messinger, Sally Ozonoff, Jonathan Sebat, Calvin Sjaarda, Isabel M. Smith, Peter Szatmari, Lonnie Zwaigenbaum, Azadeh Kushki, Thomas W. Frazier, Jacob A.S. Vorstman, Khalid A. Fakhro, Bridget A. Fernandez, M.E. Suzanne Lewis, Rosanna Weksberg, Marc Fiume, Ryan K.C. Yuen, Evdokia Anagnostou, Neal Sondheimer, David Glazer, Dean M. Hartley, and Stephen W. Scherer
- Subjects
DNA Copy Number Variations ,Autism Spectrum Disorder ,Humans ,Genetic Predisposition to Disease ,Genomics ,Autistic Disorder ,General Biochemistry, Genetics and Molecular Biology - Abstract
Fully understanding autism spectrum disorder (ASD) genetics requires whole-genome sequencing (WGS). We present the latest release of the Autism Speaks MSSNG resource, which includes WGS data from 5,100 individuals with ASD and 6,212 non-ASD parents and siblings (total n = 11,312). Examining a wide variety of genetic variants in MSSNG and the Simons Simplex Collection (SSC; n = 9,205), we identified ASD-associated rare variants in 718/5,100 individuals with ASD from MSSNG (14.1%) and 350/2,419 from SSC (14.5%). Considering genomic architecture, 52% were nuclear sequence-level variants, 46% were nuclear structural variants (including copy-number variants, inversions, large insertions, uniparental isodisomies, and tandem repeat expansions), and 2% were mitochondrial variants. Our study provides a guidebook for exploring genotype-phenotype correlations in families who carry ASD-associated rare variants and serves as an entry point to the expanded studies required to dissect the etiology in the ∼85% of the ASD population that remain idiopathic.
- Published
- 2022
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37. Associations of the modified STarT back tool and Hospital Anxiety and Depression Scale (HADS) with gait speed and knee pain in knee osteoarthritis: a retrospective cohort study
- Author
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Poon, Cheryl Lian-Li, Cheong, Philip, Tan, John Wei-Ming, Thumboo, Julian, Woon, Ee-Lin, Clark, Ross Allan, Cheok, Gary, and Pua, Yong-Hao
- Subjects
musculoskeletal diseases ,human activities - Abstract
The association of the modified STarT Back Tool (mSBT) psychosocial measure with gait speed and knee pain in knee osteoarthritis is not well defined. This study aimed to, in patients with knee osteoarthritis, (i) examine the convergent validity of mSBT with the Hospital Anxiety and Depression Scale (HADS) and (ii) compare the predictive validity of mSBT and HADS with gait speed and knee pain. We performed a retrospective cohort analysis of mSBT, HADS, gait speed, and knee pain outcomes data collected from 119 patients who received outpatient physical therapy. Of these patients who were evaluated at their first (baseline) physical therapy visit, 55 had available data at the Week-16 follow-up visit. mSBT and HADS showed moderately strong pairwise correlations (Spearman correlation > 0.57; p < 0.001). After adjusting for age, sex, body weight, and knee impairment variables in multivariable linear mixed-effects analyses, mSBT was associated with gait speed (p < 0.001) and knee pain intensity (p < 0.001) and it had comparable strength of association as HADS. In within-patient regression analyses, change in mSBT was associated with changes in gait speed (p = 0.04) and knee pain (p = 0.01) over 16 weeks. The mSBT had convergent validity with HADS and it showed predictive validity with gait speed and knee pain in knee osteoarthritis. Although broader validation is required, the 5-item mSBT psychosocial measure may be applied as part of routine clinical care to assess psychological distress in patients with knee osteoarthritis.IMPLICATIONS FOR REHABILITATIONThe 5-item psychosocial subscale of the modified STarT Back tool (mSBT) showed good convergent validity with the 14-item Hospital Anxiety and Depression Scale in patients with knee osteoarthritis.The mSBT psychosocial subscale showed predictive validity, at both cross-sectional and longitudinal levels, with gait speed and knee pain in patients with knee osteoarthritis.The mSBT can potentially be used in the busy clinical setting to assess psychological distress in patients with knee osteoarthritis. The 5-item psychosocial subscale of the modified STarT Back tool (mSBT) showed good convergent validity with the 14-item Hospital Anxiety and Depression Scale in patients with knee osteoarthritis. The mSBT psychosocial subscale showed predictive validity, at both cross-sectional and longitudinal levels, with gait speed and knee pain in patients with knee osteoarthritis. The mSBT can potentially be used in the busy clinical setting to assess psychological distress in patients with knee osteoarthritis.
- Published
- 2021
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38. Population Dynamics of Human Immunodeficiency Virus
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Lau, John Wei
- Subjects
Biology ,Ecology ,Applied mathematics ,HIV ,population dynamics ,viral dynamics - Abstract
In this work, we explore the in vivo population dynamics of HIV with mathematical and computational methods. Chapter 1 examines the effects of productive unintegrated virus (uDNA) on viral dynamics in the context of free-virus and synaptic transmission. We find that productive uDNA can contribute up to 20% towards the basic reproductive ratio of HIV in vivo. If more than one unintegrated virus is required for productive infection, then uDNA does not contribute towards R0 from free virus infection. As more viruses are successfully transmitted per synapse, the lower the contribution of uDNA. Chapter 2 explores the effect of uDNA in the context of an immune response during the asymptomatic phase. We find that productive uDNA can decrease or increase set-point viral levels compared to the case of inert uDNA, and this depends on the rate of viral production and the strength of the immune response. In Chapter 3, we explore a two-compartment model to explain the observed difference in the multiplicity of infection of HIV between the lymphoid system and the blood. Our model suggests that the absence of strong synaptic transmission in the peripheral blood tends to create many singly infected cells - reducing the proportion of multiply infected cells. Although this simple mechanism can explain much of the difference between the two systems, we also conclude that there must be some additional mechanism that is reducing the number of highly multiply infected cells in the blood.
- Published
- 2014
39. Linear dichroism infrared resonance in overdoped, underdoped, and optimally doped cuprate superconductors
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Gideon Koren, J. Cerne, T. Kirzhner, Alok Mukherjee, Chao Zhang, Andrea Markelz, Deepu George, N. P. Armitage, Jung-Hun Seo, M. M. Arik, John Wei, and H. Zhang
- Subjects
Superconductivity ,Physics ,Condensed matter physics ,Infrared ,Condensed Matter - Superconductivity ,FOS: Physical sciences ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Polarization (waves) ,Linear dichroism ,01 natural sciences ,Electromagnetic radiation ,3. Good health ,Superconductivity (cond-mat.supr-con) ,Condensed Matter::Superconductivity ,0103 physical sciences ,Cuprate ,Symmetry breaking ,010306 general physics ,0210 nano-technology ,Pseudogap - Abstract
By measuring the polarization changes in THz, infrared, and visible radiation over an extended energy range (3-2330 meV), we observe symmetry-breaking in cuprate high temperature superconductors over wide energy, doping, and temperature ranges. We measure the polarization rotation and ellipticity of transmitted radiation though thin films as the sample is rotated. We observe a two-fold rotational symmetry in the Faraday angle, which is associated with linear dichroism (LD) and occurs when electromagnetic radiation polarized along one direction is absorbed more strongly than radiation polarized in the perpendicular direction. Such polarization anisotropies can be generally associated with symmetry breakings. We measure the amplitude of the LD signal and study its temperature, energy, and doping dependence. The LD signal shows a resonant behavior with a peak in the few hundred meV range, which is coincident with the mid-infrared optical feature that has been associated with the formation of the pseudogap state. The strongest LD signal is found in under-doped films, although it is also observed in optimally- and over-doped samples. The LD signal is consistent with nematic charge ordering as well as novel magnetoelectric effects., Comment: 10 pages, 4 figures
- Published
- 2020
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40. Genomic Imbalances in the Placenta Contribute to Poor Fetal Growth
- Author
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Giulia F. Del Gobbo, Yue Yin, Sanaa Choufani, Emma A. Butcher, John Wei, Evica Rajcan-Separovic, Hayley Bos, Peter von Dadelszen, Rosanna Weksberg, Wendy P Robinson, and Ryan K.C. Yuen
- Abstract
Background: Fetal growth restriction (FGR) is associated with increased risks for complications before, during, and after birth, in addition to risk of disease through to adulthood. Although placental insufficiency, failure to supply the fetus with adequate nutrients, underlies most cases of FGR, its causes are diverse and not fully understood. One of the few diagnosable causes of placental insufficiency in ongoing pregnancies is the presence of large chromosomal imbalances such as trisomy confined to the placenta; however, the impact of smaller copy number variants (CNVs) has not yet been adequately addressed. In this study, we comprehensively evaluate the contribution of both placental aneuploidy and CNVs to fetal growth. Methods: We used molecular-cytogenetic approaches to identify aneuploidy in placentas from N=101 infants born small-for-gestational age (SGA), typically used as a surrogate for FGR, and from N=173 non-SGA controls from uncomplicated pregnancies. We confirmed aneuploidies and assessed mosaicism by microsatellite genotyping. We then profiled CNVs using high-resolution microarrays in a subset of N=53 SGA and N=61 control euploid placentas, and compared the load, impact, gene enrichment and clinical relevance of CNVs between groups. Candidate CNVs were confirmed using quantitative PCR.Results: Aneuploidy was over 10-fold more frequent in SGA-associated placentas compared to controls (11.9% vs. 1.1%; p=0.0002, OR=11.4), was confined to the placenta, and typically involved autosomes, whereas only sex chromosome abnormalities were observed in controls. We found no significant difference in CNV load or number of placental-expressed or imprinted genes in CNVs between SGA and controls, however, a rare and likely clinically-relevant germline CNV was identified in 5.7% of SGA cases. These CNVs involved candidate genes INHBB, HSD11B2, CTCF, and CSMD3. Conclusions: We conclude that placental genomic imbalances at the cytogenetic and submicroscopic level may underlie up to ~18% of SGA cases in our population. This work contributes to the understanding of the underlying causes of placental insufficiency and FGR, which is important for counselling and prediction of long term outcomes for affected cases.
- Published
- 2020
- Full Text
- View/download PDF
41. Mutual fund herding behavior and investment strategies in Chinese stock market
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Yen-Hsien Lee, Ying-Chuang Chen, and John Wei-Shan Hu
- Subjects
Economics and Econometrics ,Index (economics) ,Financial economics ,Investment strategy ,Strategy and Management ,Scopus ,0502 economics and business ,lcsh:Finance ,lcsh:HG1-9999 ,Economics ,Business and International Management ,Publication ,Herd behavior ,Mutual fund ,040101 forestry ,050208 finance ,business.industry ,mutual fund ,05 social sciences ,contrarian strategy ,04 agricultural and veterinary sciences ,Chinese stock market ,herding behavior ,0401 agriculture, forestry, and fisheries ,Stock market ,business ,macroeconomic variables ,Finance - Abstract
This investigation studies the impact of mutual fund herding on the returns achieved by contrarian strategy from 1990 to 2015 in the Chinese stock market. The relationship between the profit gained by the contrarian strategy and the macroeconomic environment is also examined. First, the returns of the contrarian strategy in China’s stock market are found to be significant. Second, most loser stocks with a high degree of mutual fund herding outperform loser stocks with a low degree of mutual fund herding, revealing that the profitability of an investment portfolio depends on the degree of mutual fund herding. Third, investors should buy loser stocks with a high degree of herding and sell winner stocks with a low degree of herding during a two-year formation period, over which zero-cost contrarian strategies yield the significantly highest return. Finally, the payoff of contrarian strategies is positively related to the herding effect and negatively related to macroeconomic variables.
- Published
- 2018
42. Copy number variation in fetal alcohol spectrum disorder
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John Wei, James N. Reynolds, Zhouzhi Wang, Albert E. Chudley, Richard F. Wintle, Mehdi Zarrei, Bhooma Thiruvahindrapuram, Molly Pind, Worrawat Engchuan, Geoffrey G. Hicks, Christian R. Marshall, Stephen W. Scherer, and Sylvia Lamoureux
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Male ,0301 basic medicine ,Pediatrics ,medicine.medical_specialty ,Population ,Gene Dosage ,Single-nucleotide polymorphism ,Polymorphism, Single Nucleotide ,Biochemistry ,03 medical and health sciences ,Epilepsy ,Fetal alcohol ,CACNA1H ,medicine ,Humans ,SNP ,Copy-number variation ,Child ,education ,Molecular Biology ,reproductive and urinary physiology ,education.field_of_study ,biology ,business.industry ,Cell Biology ,medicine.disease ,female genital diseases and pregnancy complications ,030104 developmental biology ,Fetal Alcohol Spectrum Disorders ,Child, Preschool ,biology.protein ,Autism ,Female ,Chromosomes, Human, Pair 3 ,Chromosome Deletion ,business - Abstract
Fetal alcohol spectrum disorder (FASD) is characterized by a combination of neurological, developmental, and congenital defects that may occur as a consequence of prenatal alcohol exposure. Earlier reports showed that large chromosomal anomalies may link to FASD. Here, we examined the prevalence and types of copy number variations (CNVs) in FASD cases previously diagnosed by a multidisciplinary FASD team in sites across Canada. We genotyped 95 children with FASD and 87 age-matched, typically developing controls on the Illumina Human Omni2.5 SNP (single nucleotide polymorphisms) array platform. We compared their CNVs with those of 10 851 population controls to identify rare CNVs (
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- 2018
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43. The Personal Genome Project Canada: findings from whole genome sequences of the inaugural 56 participants
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Wilson W L Sung, S. Mohsen Hosseini, Brett Trost, Stephen W. Scherer, John Wei, James Ellis, Jeffrey R. MacDonald, Sarah Bowdin, Janet A. Buchanan, M. Stephen Meyn, Miriam S. Reuter, Rohan V. Patel, Giovanna Pellecchia, Allison Hazell, Ryan A. Cook, Sergio L. Pereira, Bhooma Thiruvahindrapuram, Jennifer L. Howe, Iris Cohn, Lisa J. Strug, Ryan K. C. Yuen, Peter Pasceri, Yvonne Bombard, Joe Whitney, Hin C. Lee, Tara Paton, Anne S. Bassett, Rosanna Weksberg, Jill Davies, Barbara Kellam, Dimitri J. Stavropoulos, Wei Wei, Christian R. Marshall, Cheryl Shuman, Marc Fiume, Fred W. Keeley, Richard F. Wintle, Matthew R. Hildebrandt, Jo Anne Herbrick, Zhuozhi Wang, Peter N. Ray, Thomas Nalpathamkalam, Ronald D. Cohn, Sherilyn L. Bell, Neal Sondheimer, Daniele Merico, Susan Walker, Ann M. Joseph-George, Melanie M. Mahtani, Asli Romm, Chao Lu, Michael J. Szego, and Nasim Monfared
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Male ,0301 basic medicine ,Genetics ,Whole genome sequencing ,Canada ,Whole Genome Sequencing ,Genome, Human ,Genetic Variation ,Genes, Recessive ,Sequence Analysis, DNA ,General Medicine ,Biology ,Genome ,Personal Genome Project ,03 medical and health sciences ,030104 developmental biology ,Genotype ,Genetic variation ,Humans ,Female ,Genetic Predisposition to Disease ,Human genome ,Letters ,Copy-number variation ,Allele - Abstract
BACKGROUND: The Personal Genome Project Canada is a comprehensive public data resource that integrates whole genome sequencing data and health information. We describe genomic variation identified in the initial recruitment cohort of 56 volunteers. METHODS: Volunteers were screened for eligibility and provided informed consent for open data sharing. Using blood DNA, we performed whole genome sequencing and identified all possible classes of DNA variants. A genetic counsellor explained the implication of the results to each participant. RESULTS: Whole genome sequencing of the first 56 participants identified 207 662 805 sequence variants and 27 494 copy number variations. We analyzed a prioritized disease-associated data set (n = 1606 variants) according to standardized guidelines, and interpreted 19 variants in 14 participants (25%) as having obvious health implications. Six of these variants (e.g., in BRCA1 or mosaic loss of an X chromosome) were pathogenic or likely pathogenic. Seven were risk factors for cancer, cardiovascular or neurobehavioural conditions. Four other variants — associated with cancer, cardiac or neurodegenerative phenotypes — remained of uncertain significance because of discrepancies among databases. We also identified a large structural chromosome aberration and a likely pathogenic mitochondrial variant. There were 172 recessive disease alleles (e.g., 5 individuals carried mutations for cystic fibrosis). Pharmacogenomics analyses revealed another 3.9 potentially relevant genotypes per individual. INTERPRETATION: Our analyses identified a spectrum of genetic variants with potential health impact in 25% of participants. When also considering recessive alleles and variants with potential pharmacologic relevance, all 56 participants had medically relevant findings. Although access is mostly limited to research, whole genome sequencing can provide specific and novel information with the potential of major impact for health care.
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- 2018
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44. Development and evaluation of a personalised psychological intervention to improve adherence to photoprotection in adults with Xeroderma Pigmentosum (XP)
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Robert Sarkany, Jessica Walburn, Rebecca Anderson, Vera Araujo-Soares, Janette Boadu, Martha Canfield, Lesley Foster, Paul McCrone, Myfanwy Morgan, Sam Norton, Kirby Sainsbury, and John Weinman
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xeroderma pigmentosum ,adherence ,dosimeter ,mixed methods ,photoprotection ,rare conditions ,intervention mapping ,dermatology ,Public aspects of medicine ,RA1-1270 - Abstract
Background Poor adherence to photoprotection from ultraviolet radiation in the rare disease xeroderma pigmentosum can be life-threatening due to heightened risk of skin cancers. This novel, two-phase research programme used mixed methods to investigate photoprotection in xeroderma pigmentosum, and its psychosocial impact, to develop an intervention to improve photoprotection. Objective(s) Phase I: To identify barriers to optimal photoprotection. Phase II: To design and test a personalised psychological intervention to improve photoprotection. Design Phase I: Interview study; n-of-1 photoprotection study; objective measurement of ultraviolet radiation exposure study; international cross-sectional survey. Phase II: Consensus conference to synthesise findings and determine targets/priorities for intervention; intervention development using Intervention mapping; randomised controlled trial to test efficacy, cost-effectiveness and intervention mechanisms. Settings for Phases I and II National Xeroderma Pigmentosum Service, Guy’s and St Thomas’ NHS Foundation Trust, London, United Kingdom; Specialist xeroderma pigmentosum clinics in Regensburg, Germany, Japan, Tunisia; Patient support organisations in France and USA. Participants Children < 16 (Phase I only) and adults (> 16) diagnosed with xeroderma pigmentosum. Intervention (Phase II) XPAND is a seven-session personalised psychological intervention designed to be facilitated by non-psychologists, delivered in spring to summer 2018 versus wait list control (intervention in spring to summer 2019). Main trial outcome measure (Phase II) Average daily ultraviolet radiation dose to the face calculated by combining objective ultraviolet radiation exposure with self-reported photoprotection. Results Phase I: Varying levels of photoprotection were found, with most participants doing less than clinically recommended. The international survey (N = 156) and estimation of ultraviolet radiation dose-to-face (N = 41) found that adults had worse photoprotection than the ‘cared for’ sample, but that overall the total dose-to-face was similar in the two groups because the ‘cared for’ group were outside more. The n-of-1 study (N = 20) showed that fluctuations in protection were associated with time of day, weekday versus weekend, environmental risk perceptions and symptoms resulting from exposure, self-regulatory and psychological constructs. The qualitative study (N = 25) identified three modes of adaptation to photoprotection: (1) ‘dominated’, (2)‘integrated’ and (3) ‘resistant’. Modifiable drivers of photoprotection behaviour were identified in the survey studies, including belief-based predictors and the important role of habits. These combined findings informed the development and targets of the XPAND intervention. Phase II: The intervention group (n = 6) had significantly lower daily average ultraviolet radiation dose-to-face (primary outcome) compared to control (n = 7) (−0.25 Standard Erythemal Dose, p 16 years with a confirmed diagnosis of XP, sufficient English language comprehension and no cognitive impairment completed the measures themselves. Parents/caregivers of children (
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- 2024
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45. Plastic, It’s What’s for Dinner: A Preliminary Comparison of Ingested Particles in Bottlenose Dolphins and Their Prey
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Leslie B. Hart, Miranda Dziobak, Randall S. Wells, Elizabeth Berens McCabe, Eric Conger, Tita Curtin, Maggie Knight, and John Weinstein
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plastic pollution ,OneHealth ,contaminant ,plasticizers ,seafood safety ,marine mammal ,Oceanography ,GC1-1581 - Abstract
Microplastic ingestion was reported for common bottlenose dolphins (Tursiops truncatus) inhabiting Sarasota Bay, FL, USA, a community that also has prevalent exposure to plasticizers (i.e., phthalates) at concentrations higher than human reference populations. Exposure sources are currently unknown, but plastic-contaminated prey could be a vector. To explore the potential for trophic exposure, prey fish muscle and gastrointestinal tract (GIT) tissues and contents were screened for suspected microplastics, and particle properties (e.g., color, shape, surface texture) were compared with those observed in gastric samples from free-ranging dolphins. Twenty-nine fish across four species (hardhead catfish, Ariopsis felis; pigfish, Orthopristis chrysoptera; pinfish, Lagodon rhomboides; and Gulf toadfish, Opsanus beta) were collected from Sarasota Bay during September 2022. Overall, 97% of fish (n = 28) had suspected microplastics, and GIT abundance was higher than muscle. Fish and dolphin samples contained fibers and films; however, foams were common in dolphin samples and not observed in fish. Suspected tire wear particles (TWPs) were not in dolphin samples, but 23.1% and 32.0% of fish muscle and GIT samples, respectively, contained at least one suspected TWP. While some similarities in particles were shared between dolphins and fish, small sample sizes and incongruent findings for foams and TWPs suggest further investigation is warranted to understand trophic transfer potential.
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- 2023
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46. Copy Number Variation Analysis of 100 Twin Pairs Enriched for Neurodevelopmental Disorders
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Kristiina Tammimies, Ann Nordgren, John Wei, Britt-Marie Anderlid, Bhooma Thiruvahindrapuram, Paul Lichtenstein, Charlotte Willfors, Sven Bölte, Steve Berggren, Stephen W. Scherer, and Sofia Stamouli
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Adult ,Male ,0301 basic medicine ,Adolescent ,DNA Copy Number Variations ,Autism Spectrum Disorder ,Concordance ,Genomics ,Biology ,Young Adult ,chemistry.chemical_compound ,03 medical and health sciences ,0302 clinical medicine ,mental disorders ,Diseases in Twins ,Twins, Dizygotic ,medicine ,Humans ,Copy-number variation ,Child ,Gene ,Genetics (clinical) ,030304 developmental biology ,Sweden ,Genetics ,0303 health sciences ,Obstetrics and Gynecology ,Twins, Monozygotic ,medicine.disease ,Phenotype ,genomic DNA ,030104 developmental biology ,chemistry ,Neurodevelopmental Disorders ,Autism spectrum disorder ,Pediatrics, Perinatology and Child Health ,Female ,Genomic information ,Penetrant (biochemical) ,030217 neurology & neurosurgery - Abstract
Hundreds of penetrant risk loci have been identified across different neurodevelopmental disorders (NDDs), and these often involve rare (de novo CNVs were found in 55 MZ twin pairs, including the 13 pairs discordant for ASD. When analyzing the burden of rare CNVs among pairs concordant and discordant for ASD/NDD in comparison with typically developed (TD) pairs, no differences were found. However, we did detect a higher rate of CNVs overlapping genes involved in disorders of the nervous system in MZ pairs discordant and concordant for ASD in comparison with TD pairs (p=0.02). Our results are in concordance with earlier findings that postzygotic de novo CNV events are typically rare in genomic DNA derived from saliva or blood and, in the majority of MZ twins, do not explain the discordance of NDDs. Still, studies investigating postzygotic variation in MZ discordant twins using DNA from different tissues and single cells and higher resolution genomics are needed in the future.
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- 2018
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47. The equity-financing channel, the catering channel, and corporate investment: International evidence
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K.C. John Wei and Yuanto Kusnadi
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040101 forestry ,Finance ,Economics and Econometrics ,050208 finance ,business.industry ,Strategy and Management ,05 social sciences ,Equity (finance) ,POLK ,04 agricultural and veterinary sciences ,Monetary economics ,Equity financing ,Shareholder ,Return on investment ,0502 economics and business ,Economics ,0401 agriculture, forestry, and fisheries ,Business and International Management ,Open-ended investment company ,business ,Capital market ,Stock (geology) - Abstract
We examine how equity mispricing affects corporate investment in an international setting. We find that investment is more sensitive to stock prices for equity-dependent firms than for non-equity-dependent firms in our international sample. Investment is also more sensitive to stock prices for firms located in countries with more developed capital markets (i.e., lower costs of raising capital), higher share turnover (i.e., shorter shareholder horizons), and higher R&D intensity (i.e., more opaque assets). More importantly, the positive relation between equity dependence and the sensitivity of investment to stock prices is more pronounced for firms located in these same countries. These findings are consistent with the equity-financing hypothesis and the catering hypothesis on corporate investment proposed by Baker et al. (2003) and Polk and Sapienza (2009), respectively.
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- 2017
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48. The real effect of the initial enforcement of insider trading laws
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Yuanto Kusnadi, K.C. John Wei, Zhihong Chen, and Yuan Huang
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040101 forestry ,Economics and Econometrics ,050208 finance ,Strategy and Management ,05 social sciences ,04 agricultural and veterinary sciences ,Information environment ,Investment (macroeconomics) ,Market liquidity ,Capital allocation line ,Investment decisions ,Information asymmetry ,Law ,0502 economics and business ,Agency (sociology) ,Economics ,0401 agriculture, forestry, and fisheries ,Insider trading ,Business ,Business and International Management ,Enforcement ,Private information retrieval ,Stock (geology) ,Finance - Abstract
Based on a difference-in-differences approach, we find strong evidence that the initial enforcement of insider trading laws improves capital allocation efficiency. The effect is concentrated in developed markets and manifests shortly after the enforcement year. Further analysis shows that the improvement is positively associated with the increase in liquidity around the enforcement year and the opaqueness of the information environment before the enforcement year. The improvement is more pronounced for firms operating in more competitive markets, being more financially constrained, and with more severe agency problems. Finally, we find increased accounting performance after the enforcement and the increase is positively associated with the improvement in capital allocation efficiency. Overall, our evidence suggests that the initial enforcement of insider trading laws improves capital allocation efficiency by providing more information to guide managerial decisions and by reducing market frictions arising from information asymmetry and agency problems.
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- 2017
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49. On the flapping motion of a helicopter blade
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Fu-Shang(John) Wei and Oscar Perdomo
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Physics ,020301 aerospace & aeronautics ,business.industry ,Applied Mathematics ,Motion (geometry) ,02 engineering and technology ,Structural engineering ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Crystallography ,0203 mechanical engineering ,Linear differential equation ,law ,Modeling and Simulation ,0103 physical sciences ,Flapping ,Helicopter rotor ,business ,Fourier series - Abstract
It is well known that the flapping motion β(t) of a helicopter blade can be modeled with an inhomogeneous linear differential equation with periodic coefficients. In this paper, we compare two methods that compute the Fourier coefficients of this motion. The first method provides an algorithm to numerically find the periodic solution β(t). We provide a method to numerically compute the initial conditions of this periodic solution. Having this solution allows us easily compute as many Fourier coefficients as we want. The second method consists of either assuming that β ( t ) = β 0 + β c 1 cos ( Ω t ) + β s 1 sin ( Ω t ) to find expressions for β0, βc1, βs1 or assuming that β ( t ) = β 0 + β c 1 cos ( Ω t ) + β s 1 sin ( Ω t ) + β c 2 cos ( 2 Ω t ) + β s 2 sin ( 2 Ω t ) to find expressions for β0, βc1, βs1, βc2, βs2. Or, in case more precision is needed, we assume β ( t ) = β 0 + β c 1 cos ( Ω t ) + β s 1 sin ( Ω t ) + ⋯ + β c m cos ( m Ω t ) + β s m sin ( m Ω t ) for some m > 2. It is interesting to point out that the expressions for β0, βc1, βs1 obtained by considering β ( t ) = β 0 + β c 1 cos ( Ω t ) + β s 1 sin ( Ω t ) are different from the ones obtained when we consider β ( t ) = β 0 + β c 1 cos ( Ω t ) + β s 1 sin ( Ω t ) + β c 2 cos ( 2 Ω t ) + β s 2 sin ( 2 Ω t ) . The computation of blade flapping harmonics is extremely important for analyzing the helicopter harmonic content to gain a better understanding on how to achieve a better blade design. Blade design researchers who are unfamiliar with the first method will benefit immensely from using this method.
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- 2017
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50. Association between rehabilitation attendance and physical function following discharge after total knee arthroplasty: prospective cohort study
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Yong-Hao Pua, Cheryl Lian-Li Poon, Felicia Jie-Ting Seah, John Wei-Ming Tan, Jennifer Suet-Ching Liaw, and Hwei-Chi Chong
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Male ,medicine.medical_specialty ,Standard of care ,Knee Joint ,medicine.medical_treatment ,Biomedical Engineering ,Total knee arthroplasty ,Physical function ,Cohort Studies ,03 medical and health sciences ,0302 clinical medicine ,Physical medicine and rehabilitation ,Rheumatology ,Activities of Daily Living ,medicine ,Humans ,Orthopedics and Sports Medicine ,Prospective Studies ,Arthroplasty, Replacement, Knee ,Association (psychology) ,Prospective cohort study ,Aged ,030203 arthritis & rheumatology ,Singapore ,030222 orthopedics ,Rehabilitation ,Multivariable linear regression ,business.industry ,Attendance ,Middle Aged ,Osteoarthritis, Knee ,Treatment Outcome ,Multivariate Analysis ,Linear Models ,Physical therapy ,Female ,business - Abstract
Summary Background Rehabilitation is widely advocated and provided as a standard of care for patients with total knee arthroplasty (TKA) but its effects on intermediate- to longer-term physical function is unclear. Also unknown is the relationship between the number of rehabilitation sessions attended and functional outcomes. Methods We conducted a prospective cohort study of 1540 patients who had undergone TKA and were referred for rehabilitation. Physical function was indexed by the Short-Form 36 (SF-36) physical function score at 6 months post-TKA. We used multivariable linear regression to assess the association between rehabilitation attendance and Month-6 physical function. Among patients who attended rehabilitation, multivariable linear regression was used to examine the dose–response association between the number of sessions attended and Month-6 physical function. Results Of the 1540 patients, 68 patients did not attend rehabilitation, 86 patients attended one session, and 1386 patients attended two or more sessions. Adjusted for the propensity to attend rehabilitation, rehabilitation attendance was independently associated with better Month-6 SF-36 physical function (point estimate, 5.0 points; 95% CI, 0.5–9.5; P = 0.028 compared with patients with no rehabilitation). Among patients who attended rehabilitation, attending five sessions was associated with a 3.6-point increase in SF-36 scores (95% CI, 0.8–6.5; P = 0.01) relative to patients who attended one session. Conclusions Rehabilitation attendance post-TKA is associated with an increase in self-report physical function. Among patients who attended rehabilitation, a modest dose–response relationship was observed between the number of sessions and functional outcomes.
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- 2017
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