279 results on '"Ahmed, Islam A"'
Search Results
52. A numerical investigation of cambered wedge impact using the Lattice Boltzmann method
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Ahmed Islam and Brandon Taravella
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Mechanical Engineering ,Applied Mathematics ,Automotive Engineering ,General Engineering ,Aerospace Engineering ,Industrial and Manufacturing Engineering - Published
- 2022
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53. Autologous platelet-rich plasma in the treatment of third-degree pressure ulcers; pilot randomized-controlled trial.
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Habib, Tamer N., Fayed, Akram M., Deghady, Akram A., Maklad, Osama M., and Ahmed, Islam E.
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PLATELET-rich plasma ,RANDOMIZED controlled trials ,PRESSURE ulcers ,WOUND healing ,CYTOKINES - Abstract
Background Platelet-rich plasma (PRP) is a mixture of cytokines, thrombocytes as well as multiple growth factors which are produced mainly by α-granules of platelets which enhance the process of natural healing process with less time. The role of autologous PRP in managing nonhealing pressure ulcers has been questioned as it enhances tissue healing by providing the necessary growth factors. Objectives Determining the relative efficacy of autologous PRP in treating grade III skin ulcers compared with standard care. Methods In this pilot randomized-controlled trial, 28 patients with grade III pressure ulcers in the critical care units of Alexandria Main University Hospital were enrolled and randomized into two groups. Patients of group A were subjected to PRP injections in the periphery of their pressure ulcers along with the standard care, while group B were subjected only to the standard care of pressure ulcers. Results PRP group showed significantly reduced mean ulcer volume at week 1 (18.88 vs. 21.42, P=0.047), week 2 (17.14 vs. 21.15, P=0.017), week 3 (14.92 vs. 19.99, P=0.020) and week 4 (10.68 vs. 17.35, P=0.019) than control group. PRP group showed significantly reduced mean ulcer surface area at week 1 (13.76 vs. 14.81, P=0.047), week 2 (10.64 vs. 14.11, P=0.032), week 3 (8.00 vs. 14.17, P=0.013) and week 4 (6.30 vs. 12.94, P=0.023) than control group. Conclusion Adding weekly autologous PRP injections to the standard care of noninfected grade III pressure ulcers may be a potentially effective approach. In critically ill patients, it was associated with reduced ulcer volumes, reduced ulcer surface areas, and better healing starting from the first week of injections. [ABSTRACT FROM AUTHOR]
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- 2023
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54. Role of enteral metoprolol tartrate on hemodynamics and clinical outcomes of septic shock patients of various pretargeted heart rate groups.
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Habib, Tamer N., Fayed, Akram M., Marouf, Mohamed M., and Ahmed, Islam E.
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METOPROLOL ,HEMODYNAMICS ,SEPTIC shock ,HEART beat ,INTENSIVE care units - Abstract
Introduction Although septic shock mortality has decreased lately due to better identification and timely application of therapies. Research has continued for 20 years, but no therapies have been discovered yet to change sepsis's course once it is infected. Objective The aim of this study was to evaluate the effect of enteral metoprolol tartrate on hemodynamics and clinical outcomes in patients with septic shock grouped into various pretargeted heart rate (HR) groups. Methods Septic shock patients (n=90) were randomly assigned directly after the resuscitation into 3 groups (30 in each). Then, treatment with metoprolol tartrate was started. The dose of metoprolol was 25-150mg every 12 h and increased gradually to reach the pretargeted HR group range; group A (HR=60-70 beats/ min), group B (HR=71-80 beats/min), and group C (HR=81-90 beats/min). Metoprolol was continued to maintain the targeted HR till either discharge form intensive care unit (ICU) or death. The primary outcomes measured were mean arterial pressure (MAP), mixed venous oxygen saturation (SvO
2 ), serum lactate, and sequential organ failure assessment (SOFA) score. Results After 1 day, group A (60-70 beats/min) had a significantly higher MAP (61.73±6.39 mmHg) than group B (51.33±7.76 mmHg) and group C (52.0±7.14 mmHg) (P < 0.001). After 3 days, group A had a significantly improved SvO2 , lower serum lactate, and lower SOFA score than the other groups (all P < 0.05). When compared with groups B and C, group A had decreased norepinephrine (NE) requirements (P < 0.001) and shorter ICU stay (P=0.001). Conclusion Targeting HR between 60-70 beats/min using metoprolol tartrate, when compared with higher targets in septic shock after hemodynamic stabilization, was not associated with profound hypotension but also with earlier improved MAP, tissue perfusion measured as SvO2 and serum lactate, and organ failure measured as the SOFA score. It also showed decreased Norepinephrine requirements and a shorter ICU stay, but with no 28-day mortality benefit. [ABSTRACT FROM AUTHOR]- Published
- 2023
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55. Introduction of Spring-Assisted Cranioplasty for Sagittal Craniosynostosis in a Craniofacial Service: A Report of Early Experience.
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Bakri, Sherif, Mazeed, Ahmed S., Saied, Samia, Abdelhamied, Ahmed Kamal, Kenawy, Karam, Aly, Haitham M., Ahmed, Islam Mokhtar, Sadek, Abdelrahim Abdrabou, Othman, Amr Ahmed, Kolby, Lars, and Elsherbiny, Ahmed
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- 2023
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56. Steam gasification of oil palm trunk waste for clean syngas production
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Nipattummakul, Nimit, Ahmed, Islam I., Kerdsuwan, Somrat, and Gupta, Ashwani K.
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- 2012
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57. (Invited) Integrated Perovskites Oxides on Silicon: From Optical to Quantum Applications
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Merckling, Clement, primary, Ahmed, Islam, additional, Tsang, Tsang Hsuan, additional, Kaviani, Moloud, additional, Genoe, Jan, additional, and De Gendt, Stefan, additional
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- 2022
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58. Integrated data analysis reveals significant associations of KEAP1 mutations with DNA methylation alterations in lung adenocarcinomas
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Akhileshwar Namani, Xiuwen Tang, Ahmed Islam El-Manawy, Ahmed Hammad, Mohamed Elshaer, and Xiu Jun Wang
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Male ,Aging ,Lung Neoplasms ,DNA Mutational Analysis ,Adenocarcinoma of Lung ,Biology ,NRF2 ,Transcriptome ,chemistry.chemical_compound ,Cell Line, Tumor ,Gene expression ,medicine ,Humans ,Lung cancer ,Gene ,Epigenomics ,DNA methylation ,Kelch-Like ECH-Associated Protein 1 ,Cancer ,DNA, Neoplasm ,Cell Biology ,TCGA ,Prognosis ,medicine.disease ,KEAP1 ,lung cancer ,chemistry ,Mutation ,Cancer research ,Female ,DNA ,Research Paper ,Signal Transduction - Abstract
KEAP1 regulates the cytoprotection induced by NRF2 and has been reported to be a candidate tumor suppressor. Recent evidence has shown that mutations in several driver genes cause aberrant DNA methylation patterns, a hallmark of cancer. However, the correlation between KEAP1 mutations and DNA methylation in lung cancer has still not been investigated. In this study, we systematically carried out an integrated multi-omics analysis to explore the correlation between KEAP1 mutations and DNA methylation and its effect on gene expression in lung adenocarcinoma (LUAD). We found that most of the DNA aberrations associated with KEAP1 mutations in LAUD were hypomethylation. Surprisingly, we found several NRF2-regulated genes among the genes that showed differential DNA methylation. Moreover, we identified an 8-gene signature with altered DNA methylation pattern and elevated gene expression levels in LUAD patients with mutated KEAP1, and evaluated the prognostic value of this signature in various clinical datasets. These results establish that KEAP1 mutations are associated with DNA methylation changes capable of shaping regulatory network functions. Combining both epigenomic and transcriptomic changes along with KEAP1 mutations may provide a better understanding of the molecular mechanisms associated with the progression of lung cancer and may help to provide better therapeutic approaches.
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- 2020
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59. Impact of genetic polymorphisms on the degree of ovarian response to gonadotrophin stimulation in patients undergoing ICSI treatment
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Ahmed, Islam Ahmed Abdelsalam
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Intrazytoplasmatische Spermieninjektion ,Genetic Polymorphism ,Ovarian response ,ICSI - Published
- 2022
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60. Numerical study of drop impact on slippery lubricated surfaces
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Ahmed Islam and Yongsheng Lian
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Fluid Flow and Transfer Processes ,Mechanics of Materials ,Mechanical Engineering ,Computational Mechanics ,Condensed Matter Physics - Abstract
We numerically study drop impact on slippery lubricated surfaces at varied impact speeds to comprehend the cloaking of the water drop by the lubricant. We employ a multi-material and multi-phase interface reconstruction method to capture the interaction between the drop and the lubricants of varying interfacial tensions. We demonstrate that cloaking occurs when lubricant water interfacial tensions are low and impact speeds are low. Our research demonstrates that the thickness of the encapsulating lubricant layer varies over time. At moderate impact speeds of 0.25 and 0.5 m/s, the drop displaces a large amount of lubricant, generating a lubricant–water jet, as we also demonstrate. At high impact speeds of 5 and 30 m/s, a secondary impingement forms, which displaces a significant amount of lubricant to reveal the underneath substrate that was not visible at lower impact speeds. Finally, we investigate the drop impact on lubricant infused micro-wells with varying spacing. We find that small spacing between the micro-well walls can limit lubricant drainage and displacement. The substrates with micro-wells exhibit far less splashing than those without. Furthermore, we demonstrate that micro-wells are better at preserving lubricants than substrates without micro-wells.
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- 2023
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61. Validation and comparison between two warfarin dosing clinical algorithms and warfarin fixed dosing in specialized heart center: cross-sectional study
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Elnour, Asim Ahmed, Mohammed Ahmed, Islam, Khalid A, Al-Kubaissi, Elmustafa, Mohamed, Elnour, Asim Ahmed, Mohammed Ahmed, Islam, Khalid A, Al-Kubaissi, and Elmustafa, Mohamed
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Background: Warfarin is well known as a narrow therapeutic index that has prodigious variability in response which challenges dosing adjustment for the maintenance of therapeutic international normalized ratio. However, an appreciated population not on new oral anticoagulants may still need to be stabilized with warfarin dosing. Objective: The current study’s main objective was to validate and compare two models of warfarin clinical algorithm models namely the Gage and the International Warfarin Pharmacogenetics Consortium (IWPC) with warfarin 5 mg fixed standard dosing strategy in a sample of Sudanese subjects. Method: We have conducted a cross-sectional study recruited from the out-patient clinic at a tertiary specialized heart center. We included subjects with unchanged warfarin dose (stabilized), and with therapeutic international normalized ratio. The predicted doses of warfarin in the two models were calculated by three different methods (accuracy, clinical practicality, and the clinical safety of the clinical algorithms). Main outcome measure: The primary outcomes were the measurements of the clinical (accuracy, practicality, and safety) in each of the two clinical algorithms models compared to warfarin 5 mg fixed standard dose strategy. Results: We have enrolled 71 Sudanese subjects with mean age (51.7 ± 14 years), of which (49, 69.0%) were females. There was no significant difference between the warfarin 5 mg fixed standard dose strategy and the predicted doses of the two clinical algorithm models (MAE 1.44, 1.45, and 1.49 mg/day [P =0.4]) respectively. In the clinical practicality, all of the three models had a high percent of subjects (95.0%, 51.9%, and 66.7%) in the ideal dose range in middle dose group (3-7 mg/ day) for warfarin 5 mg fixed standard dosing strategy, Gage, and IWPC clinical algorithm models respectively. However, a small percent of subjects was exhibited in the warfarin low dose group ≤ 3 mg/day (0.0%, 15.0%, and 10.0%) and warfarin high
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- 2022
62. Analgesia for Postoperative Pain in Laparoscopic Surgery: Review Article
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Mohamed, Emad Eldin Fatthy, primary, Hassan, Khaled M., additional, Aboelwafa, Wessam A., additional, and Ahmed, Islam M., additional
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- 2022
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63. Identification of some Drought and Salinity Genes in four wheat cultivars (Triticum aestivum)
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Ahmed, Islam, primary
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- 2022
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64. Integrated Perovskites Oxides on Silicon: From Optical to Quantum Applications
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Merckling, Clement, Ahmed, Islam, Tsang, Tsang Hsuan, Kaviani, Moloud, Genoe, Jan, and De Gendt, Stefan
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ispartof: pages:1060-1060 ispartof: ECS Meeting Abstracts pages:1060-1060 ispartof: 241st ECS Meeting location:IOP Publishing date:29 May - 2 Jun 2022 status: Published online
- Published
- 2022
65. The Effect of Weather Pattern on the Second Wave of Coronavirus: A cross study between cold and tropical climates of France, Italy, Colombia, and Brazil
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Ahmed Islam
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This study aims to explore and understand the common belief that COVID infection rate is highly dependent on either the outside temperature and/or the humidity. Thirty-six regions/states from two humid-tropical countries, namely Brazil and Colombia and two countries with temperate climate, France and Italy, are studied over the period of October to December. Daily outside temperature, relative humidity and hospitalization/cases are analyzed using Spearman’s correlation. The eighteen cold regions of France and Italy has seen an average drop in temperature from 10°C to 6°C and 17°C to 7°C, respectively, and France recorded an addition of 2.3 million cases, while Italy recorded an addition of 1.8 million cases. Outside temperature did not fluctuate much in tropical countries, but Brazil and Colombia added 4.17 million and 1.1 million cases, respectively. Köppen–Geiger classification showed the differences in weather pattern between the four countries, and the analysis showed that there is very weak correlation between either outside weather and/or relative humidity alone to the COVID-19 pandemic.
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- 2021
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66. High temperature steam gasification of wastewater sludge
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Nipattummakul, Nimit, Ahmed, Islam, Kerdsuwan, Somrat, and Gupta, Ashwani K.
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- 2010
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67. Role of ascorbic acid infusion in critically ill patients with transfusion‐related acute lung injury
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Kassem, Amira B., primary, Ahmed, Islam, additional, Omran, Gamal, additional, Megahed, Mohamed, additional, and Habib, Tamer, additional
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- 2022
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68. Transversus Abdominis Plane (TAP) Block: Review Article
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Mahmoud, Wael Alham, primary, Omar, Mahmoud Mohamed Mahmoud, additional, Ahmed, Islam Mokhtar, additional, and EL Khayat, Hala Mahmoud Hashim, additional
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- 2022
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69. Fast RTL Implementation of A* Path Planning Algorithm
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Osama, Adham, primary, Mostafa, Ahmed, additional, Mamdouh, Eslam, additional, Gamal, Mohamed, additional, Imam, Usama, additional, Taha, Mohamed, additional, Khalil, Ahmed, additional, Ahmed, Islam, additional, and Mostafa, Hassan, additional
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- 2021
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70. Cardiac Dysfunction and Serum Ferritin Level as Early Prognostic Markers in Children with Sepsis: A Cross-sectional Study
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M. Ismail, Ahlam, primary, Ahmed El Sayed Ahmed Abu Elela, Mostafa, additional, Nashaat Roshdy Ahmed, Islam, additional, and Mohamed Sabry Mahmoud, Nagwa, additional
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- 2021
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71. CHARACTERISTICS OF HARDENED CONCRETE INCORPORATING CEMENT KILN DUST (CKD) AND SILICA FUME (SF)
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Rafik Khairy Abdelwahab, Mohammed Taha Nooman, Arafa Elsayed Elhelloty, and Ahmed Islam M. Abdullah
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Cement ,Animal science ,Silica fume ,Chemistry ,Cement kiln - Abstract
In this research characteristics of hardened concrete containing cement kiln dust and silicafume as a partial replacement of cement were studied. These characteristics inclusion oncompressive strength, electrical conductivity, water sorptivity and accelerated corrosion, foreach mixture X-ray diffraction were carried out for determined mineralogical analysis of therepresentative concrete sample. Concrete specimens were prepared with different ratios ofCKD and constant ratio 15% SF as a partial replacement by weight of cement. The test resultshad revealed that The use of CKD as partial replacement of cement in combination with SF inconcrete were shown best performance than use CKD only. The amount of 20% CKD in thepresence 15% SF as a partial replacement by weight of cement were the optimum ratios canbe used in concrete mixtures without lower on compressive. At 5%, 10% and 15% CKDwith constant 15% SF at frequencies 0.12, 1.0 and 10 kHz, the electrical conductivity wereincreased with increased CKD amount, whereas beyond 15% CKD efficiency of electricalconductivity were decreased with increase CKD amount at all frequencies. But at (10% to25%) CKD, sorptivity value were increased with increase CKD amount when comparisonwith control mixture. The replacing of cement with CKD and SF, give – about - the samecorrosion rate which clear shown from XRD analysis. الغرض من ھذه الدراسة ھو کيفية الاستفادة من غبار فرن الأسمنت الذي ينتج بکميات کبيرة في المصانع أثناء عمليةتصنيع الأسمنت ويتم التخلص منھ. ويھدف ھذا البحث الي دراسة خصائص الخرسانة المتصلدة التي تحتوي علي غبارفرن الأسمنت و غبار السليکا فيوم کإستبدال جزئي للأسمنت في الخرسانة. وتتضمن ھذه الخصائص مقاومة الضغطوالتوصيلية الکھربية وامتصاص المياه بالخاصية الشعرية والتآکل المتسارع للحديد ، کما تم تحديد المعادن الرئيسية لکلخلطة عن طريق تحليل (اکس ار دي). وقد تم تجھيز العينات بنسب مختلفة من غبار فرن الأسمنت مع نسبة ثابتة في کلالخلطات من غبار السليکا فيوم کاستبدال جزئي بالوزن من الأسمنت. وأظھرت النتائج أن استبدال الأسمنت بغبار فرنالأسمنت مع غبار السليکا فيوم يحسن من أداء الخرسانة أفضل من الاستبدال للأسمنت بغبار فرن الاسمنت فقط. واتضح أيضا أن النسبة المثلي لاستبدال الاسمنت في الخرسانة ھي ٢٠ % غبار فرن الاسمنت و ١٥ % غبار السليکا فيوم دون أي% نقصان في مقاومة الضغط . تزداد التوصيلية الکھربية بزيادة نسبة غبار الاسمنت من ٥% حتي ١٥ % مع ثبات نسبة ١٥غبار السليکا فيوم لکل الخلطات عند الترددات ٠.١٢ و ١.٠ و ١٠ کيلو ھرتز، في حين يزداد امتصاص المياه بالخاصيةالشعرية بزيادة نسبة غبار فرن الأسمنت من ١٠ % حتي ٢٥ % مع ثبات نسبة ١٥ % غبار السليکا فيوم لکل الخلطات وذلکعند المقارنة بالعينة المرجعية. کما لوحظ أيضا من تحليل (اکس ار دي) أن استبدال الاسمنت بغبار فرن الاسمنت وغبارالسليکا فيوم يعطي معدل تآکل للحديد متشابھ لکل الخلطات ذات النسب المختلفة من غبار فرن الاسمنت مع ثبات نسبة غبارالسليکا فيوم.
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- 2020
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72. Infield oilseed rape images segmentation via improved unsupervised learning models combined with supreme color features
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Ahmed Islam El-Manawy, Haiyan Cen, Yong He, and Alwaseela Abdalla
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0106 biological sciences ,Computer science ,business.industry ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Initialization ,Forestry ,Pattern recognition ,04 agricultural and veterinary sciences ,Image segmentation ,Horticulture ,Mixture model ,01 natural sciences ,Computer Science Applications ,Naive Bayes classifier ,ComputingMethodologies_PATTERNRECOGNITION ,Feature (computer vision) ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Unsupervised learning ,Segmentation ,Artificial intelligence ,Cluster analysis ,business ,Agronomy and Crop Science ,010606 plant biology & botany - Abstract
The variability of illumination and weather conditions lead to a big challenge for infield image segmentation. Therefore, robust, fast, and automated algorithms are highly required to obtain reliable image segmentation results. This research was aimed to develop efficient unsupervised clustering algorithms for oilseed rape image segmentation in the field. The Naive Bayes rule was first employed to select a supreme color feature from ten color models. An initialization approach based on the genetic algorithm (GA) was then used to define the initial cluster centroids for subsequent Gaussian mixture model (GMM), self-organizing map (SOM), fuzzy c-mean (FCM), and k-means algorithms. The length of the chromosome was determined using cluster validity indices. Finally, the performances of these algorithms were evaluated based on the image segmentation quality and computation time. After testing the proposed method on the image datasets from two fields, the results revealed that the highest segmentation accuracy of 96% was obtained using the optimized SOM and the lowest computation time was obtained using the k-means. The GA-based initialization speeded up the convergence process and ensured consistent labeling between runs. All clustering algorithms were proved to be robust to varying illumination conditions and can process images with a very complex background in an automated fashion.
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- 2019
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73. HSI-PP: A flexible open-source software for hyperspectral imaging-based plant phenotyping
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Ahmed Islam ElManawy, Dawei Sun, Alwaseela Abdalla, Yueming Zhu, and Haiyan Cen
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Forestry ,Horticulture ,Agronomy and Crop Science ,Computer Science Applications - Published
- 2022
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74. Serum interleukin-6 as a predictor of the severity of coronavirus disease 2019.
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Ahmed, Islam M., Hefny, Hesham M., Ali, Amal H., Refaie, Bahaa M., Abdelal, Khalid M., and Taha, Elhaisam M.
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CORONAVIRUS diseases , *INTERLEUKIN-6 , *C-reactive protein , *RESPIRATORY insufficiency - Abstract
Background Inflammatory markers like interleukin-6 (IL-6) are linked to the worse outcome in coronavirus disease 2019 (COVID-19) cases. Other markers such as C-reactive protein are not as reliable as IL-6 in predicting respiratory failure. Aim To assess the function of IL-6 as a predictor of COVID-19 severity. Patients and methods A total of 50 severe and critical patients with PCR-confirmed COVID-19 were included. All enrolled patients followed the case definition for confirmed cases of Egyptian national protocol for COVID-19 issued by MOHP. Clinical assessment, imaging, and laboratory data were recorded at admission. Pulmonary function was evaluated by SpO2/FiO2 ratio. Outcomes included hospital stay, prognosis of the disease, complications, death rate, and discharge, which were recorded during the follow-up. Results The elevated IL-6 group showed a significantly higher critical rate (87.1%) than the normal IL-6 group (26.3%) (P<0.0001), and the improvement rate was higher in the normal IL-6 group (73.7%). Moreover, the death rate was significantly greater in the elevated IL-6 group (38.7%) than the normal IL-6 group (10.5%) (P=0.033). The cutoff value of IL-6 levels in prediction of severity and mortality of COVID-19 was assessed. Our receiver operating characteristic results revealed that IL-6 cutoff value is higher than 50.27 for severity and the cutoff value is greater than 120.83 for mortality. The sensitivity values of IL-6 for severity and mortality were 93.3 and 90.5%, respectively, and the specificity values were 90.0 and 86.7%, respectively. Conclusion Elevated levels of serum IL-6 in COVID-19-infected patients were related with a variety of adverse outcomes, including severe illness, mechanical ventilation, and acute respiratory distress syndrome. When it came to accurately predicting the severity and mortality of COVID-19, the optimum IL-6 cutoff levels were 50.27 and 120.83 pg/ml, respectively. [ABSTRACT FROM AUTHOR]
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- 2023
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75. Magnesium sulfate versus dexamethasone as an adjuvant in the ilioinguinal and iliohypogastric nerve blocks.
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Ahmed, Islam M., Hassan, Ahmed H., Refaie, Bahaa M., Soliman, Fouad I., and Abdelkareem, Ayman M.
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MAGNESIUM sulfate , *DEXAMETHASONE , *NERVE block , *INGUINAL hernia , *ANALGESIA - Abstract
Introduction Ilioinguinal and iliohypogastric (IIIH) nerve blocks help to manage postoperative pain that occurs following inguinal hernia repair or varicocelectomy. Aim The study aimed to compare the effect of adding magnesium sulfate or dexamethasone to levobupivacaine for iliohypogastric and ilioinguinal nerve blocks, in terms of postoperative analgesic length, visual analog scale ratings, first analgesic requirements, and hemodynamic changes. Patients and methods The study included 86 patients, aged 20-70 years, who were divided into two groups (D and M). Patients in group D received 9ml of 0.5% levobupivacaine for the nerve block plus 1ml dexamethasone (8 mg), whereas patients in groupMreceived 9ml 0.5% levobupivacaine plus 1ml magnesium sulfate 10% (100 mg). Postoperative analgesia, visual analog scale scores, and any complications were documented. Results Group D had a significantly longer analgesic time. A significantly lower amount of analgesic was consumed on the first postoperative day with significantly low pain score as compared with group M. Conclusion The addition of dexamethasone to levobupivacaine for IIIH nerve blocks improved the postoperative analgesia. [ABSTRACT FROM AUTHOR]
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- 2023
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76. Dialysis catheter-related sepsis resulted in infective endocarditis, septic pulmonary embolism and acute inferolateral STEMI: a case report.
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Ahmed, Islam Abdelmoneim, Asiri, Abdullah Ali, Attia, Mohamed, and Alshehri, Saleh
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INFECTIVE endocarditis ,PULMONARY embolism ,MYOCARDIAL infarction ,ST elevation myocardial infarction ,CHRONIC kidney failure ,HEART block - Abstract
Background Embolic myocardial infarction is an uncommon but increasingly recognized complication of infective endocarditis (IE). Although the incidence is low and ranges from 1% to 10%, the mortality rate is high (64%). The characteristics of septic embolism on presentation are nonspecific and usually are unrecognized by clinicians. This case report aims to build a high index of suspicion among clinicians for IE presenting with the complication of embolic myocardial infarction especially in patients with indwelling venous catheters. Case Summary A 62-year-old woman with end-stage renal disease on haemodialysis presented with shortness of breath and desaturation. Her history was significant for end-stage renal disease managed with regular haemodialysis by a right-sided double-lumen tunnelled catheter. An initial diagnosis was made of pulmonary embolism, and management with intravenous heparin was initiated. She subsequently developed inferolateral ST-elevation myocardial infarction, and treatment with percutaneous coronary intervention to the posterior descending artery failed. Then, the patient developed complete heart block, aortic valve vegetation, acute severe aortic regurgitation, and shock. Discussion Acute coronary syndrome is usually an early and uncommon complication of IE and the risk of embolism decreases after antibiotic therapy is initiated. Due to the low incidence of coronary events in IE, only case reports have been published. Most patients with septic pulmonary embolism have a presentation similar to that for pneumonia. The diagnosis is therefore often delayed, which consequently influences prognosis. Our case report presents an example of IE-related multiple systemic embolization with poor patient outcome due to delayed diagnosis. [ABSTRACT FROM AUTHOR]
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- 2023
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77. Age and frailty are independently associated with increased covid-19 mortality and increased care needs in survivors: results of an international multi-centre study
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Alsahab, Mustafa, Beishon, Lucy, Brown, Bryony, Burn, Elinor, Burton, Jenni K, Cox, Natalie, Dani, Melanie, Elhadi, Muhammed, Freshwater, Sarah, Gaunt, Victoria, Gordon, Adam, Goujon, Marie, Hale, Matthew, Hughes, Terry, Jackson, Thomas A, Jelley, Benjamin, Khan, Asma, Khiroya, Heena, Lal, Rajni, Madden, Katy, Magill, Laura, Masoli, Jane, Masud, Tahir, McCluskey, Lauren, McNeela, Natalie, Mohammedseid-Nurhussien, Awolkhier, Moorey, Hannah, Lochlainn, Mary Ni, Nirantharakumar, Krishnarajah, Okoth, Kelvin, Osuafor, Christopher N, Patterson, Katherine, Pearson, Grace M E, Perry, Rita, Pettitt, Michala, Pigott, Jennifer, Pinkney, Thomas, Quinn, Terence, Reynolds, Abigail, Richardson, Sarah, Sanyal, Nik, Seed, Adam, Sleeman, Isobel, Soo, Chee, Steves, Claire, Strain, W David, Taylor, Joanne, Torsney, Kelli, Welch, Carly, Wilson, Daisy, Witham, Miles, Elazeem, Hossam Aldein S Abd, Abdelhafez, Mohammed H, Abdelmalak, Amir, Abdelwahab, Omar A, Abdulhadi, Osama M A S, Adewole, Olubayode, Ahmad, Mohammed, Ahmed, Eltayeb A, Ahmed, Hazem, Ahmed, Islam A, Akcay, Mertcan, Akdeniz, Yeşim, Akın, Emrah, Akladious, Carolyn, Alessandri, Francesco, Ali, Ali, Aljafari, Abdulmalek, Aljafari, Abdulmoiz, Al-Sadawi, Mohammed, Al-Sodani, Lobna, Altintoprak, Fatih, Amaratungaz, Gitanjali, Amer, Jocelyn, Amini, Sylvia, Amir, Taha, Anandarajah, Cheran, Anders, Rachael, Ansari, Muhammed H, Appiah, Kingsley, Atia, Jolene, Atkin, Catherine, Aujayeb, Avinash, Awad, Elsayed M, Azab, Mohammed A, Azam, Mohammad T, Aziz, Sally, Azzam, Ahmed Y, Babar, Laxmi, Babb, Laura, Badh, Manpreet, Baguneid, Clare, Bailey, Emily, Baili, Efstratia, Baldwin, Sarah, Baloyiannis, Ioannis, Bannerjee, Moulinath, Barnard, Anna, Barra, Fabio, Bashir, Hannah, Bawor, Monica, Bayhan, Zülfü, Belcher, James, Belgamwar, Ravindra, Bentley, Corrina, Birchenough, Amy, Bo, Yen Nee J, Boden, Hayley R, Bouhuwaish, Ahmad, Brachini, Gioia, Bremner, Laura, Bridgwater, Hannah, Bryant, Catherine, Budd, Gabrielle, Budd, Sharon, Budzikoski, Adam, Bulla, Reem, Buondonno, Antonio, Burden, Nicole, Butt, Hejab, Capoglu, Recayi, Caracostea, Andra, Cardoso, Rifa, Carr, Alexis, Carrasco-Prats, Milagros, Cattel, Caterina, Ceccarelli, Giancarlo, Cecere, Giuseppe, Charalabopoulos, Alexandros, Charsley, Evelyn, Cheney-Lowe, Hannah, Chevallier, Theodore, Choudhry, Asad J, Ciccarone, Flavia, Cicerchia, Pierfranco M, Cirillo, Bruno, Collins, Fatma D, Comerford, Victoria, Cordie, Ahmed, Coulter, Siobhan, Coulthard, Nick, Cox, Catrin, Cox, Victoria, Crowe, Andrew, Cullen, Jack, Cummings, Jean, Cunningham, Niamh, Curley, Daniel, Currie, Hannah, Daly, Madeleine, Darley, Jay, Dattani, Nikhita, Davakis, Spyridon, Davies, Rowan, De Paola, Gilda, De Toma, Giorgio, Del Valle-Ruiz, Sergio, Deldar, Benyamin, Demir, Hakan, Desai, Arjun, Desai, Nirali, Devaney, Alice, Dew, Lindsey, Dhesi, Jugdeep, Dias, Maria, Dick, Gordon, Doddamani, Parveen, Dogra, Gurinder, Doll, Tina, Dooley, Hannah C, Dost, Samiullah, Dotchin, Catherine, Dowell, Hannah, Draghita, Ioan M, Dundas, James M, Duranti, Giulia, Dusara, Hiren, Dwivedi, Rajesh, Dyer, Adam H, Eastaugh, Alison, Edwards, Elinor, Elghazaly, Shrouk M, Elmehrath, Ahmed O, Elrick, Hope, El-Shazly, Mostafa, Emery, Alexander, Etchill, Eric W, Evans, Sarah, Evison, Felicity, Fairhead, Cassandra, Faulkner, Margherita, Felska, Agnieszka, Fernandez, Antia, Fernández-Fernández, Pedro V, Ferraiolo, Antonella, Ferrero, Simone, Fiori, Enrico, Firat, Necattin, Fisk, Gracie, Fleck, Anna, Fonsi, Giovanni B, Gabre-Kidan, Alodia, Gallo, Gaetano, Gandhi, Ratnam, Garner, Madeleine, Georgiou, Nikolaos, Gerretsen, Hannah, Ghannam, Nourhan A A, Ghobrial, Andrew, Ghobrial, Hedra, Ghufoor, Zaynub, Gibbon, Jake, Gilbert, Georgia F, Giles, Marie, Giménez-Francés, Clara, Gonullu, Emre, Gray, Amy, Gray, Joshua H, Green, Deirdre, Greene, Charlotte, Griffin, Ellanna, Griffith, Karla, Grubb, Anthony, Guan, Yue, Guerero, Daniel N, Gupta, Ayushi, Gustavino, Claudio, Guzman, Laurenny, Hadreiez, Ahmed K M, Hajiioannou, Jiannis, Hanji, Deevia, Madhavan, Deepthy Hari, Harmantepe, Tarık, Harrison, Patrick, Hart, Barbara, Haslam, Aidan, Haunton, Victoria, Haut, Elliott R, Heinsohn, Torben, Hennah, Lindsay, Hetta, Helal F, Hickman, Alexander, Hobill, Abigail, Hogan, Patrick C P, Hogan, Vesna, Holmes, Elizabeth, Honney, Katie, Hood, Katharine, Hopkinson, Katherine, Howells, Lara, Hrouda, Nicole, Hunsley, Danielle, Hurst, William, Hussein, Rand A, Ibrahim, Mohamed Eltaher A A, Ibtida, Ishmam, Ibukunoluwakitan, Aina, Ishlek, Irem, Iyer, Rishi, Jackson, Karl, Jackson, Rosie, James, Ellen, Jarvis, Hayley, Jeffs, Sophie, Jenko, Nathan, Jeyakumar, Sasha, Kabir, Shahriar, Kainth, Harjinder, Kalloo, Jason, Kanzaria, Akhil, Karapanou, Amalia, Kardaman, Nuha, Karthikeyan, Sandeep, Karunatilleke, Anne, Kelly, Mairead, Kelly, Nicola I, Khalid, Hesham, Khan, Haris, Khan, Muhammad S, King, Matthew, Kneen, Thomas, Kok, Li, Kratochwila, Chiara, Kuzeva, Aneliya, Lapolla, Pierfrancesco, Lau, Rebecca, Law, Kar Yee, Leadbetter, Aimee, Lee, Gabriel, Lee, Helena, Levinson, Gavriella, Lewis, Grace, Liakakos, Theodore, Lim, Stephen, Lis, Danielle, Livesey, Emma, López-Morales, Pedro, Lowes, Lily, Lunt, Eleanor, Lyon, Emily, Madan, Suvira, Majid, Zeinab, Malapati, Harsha, Man, Jade, Mandane, Baguiasri, Manning, Sarah H, Mantoglu, Baris, Martínez-Sanz, Nuria, Marx, William, Masood, Almontacer E B, Maughan, Tom, Mawhinney, Jamie, Maxfield, Dominic, Mayer, Jordan, Maynard, Henry, McDonald, Claire, McGovern, Aine, Mclachlan, Sophie, Medina-Manuel, Esther, Meneghini, Simona, Metcalf, Michelle, Millwood-Hargrave, John, Mingoli, Andrea, Miu, Kelvin, Mohamed, Fawsiya, Mohamed, Soha M, Hussein, Aliae A R Mohamed, Mohammad, Abdulkader, Mohammed, Aaliya, Momen, Ahmed A, Moomo, Farhana, Mora-Guzmán, Ismael, Moriarty, Lizzie, Morrin, Hamilton, Morris, Claire, Moss, Nicholas, Moustafa, Mohamed M, Mpoura, Maria, Mubin, Mohammed, Muhtaroglu, Ali, Muir, Georgina, Mulhern, Stephanie, Muller, Daniel, Murphy, Declan C, Muzammil, Bushra, Nadkarni, Varun, Nageh, Mariam Albatoul, NasrEldin, Yasmin K, Nawaz, Wasim, Nguyen, Hanna, Cheallaigh, Cliona Ni, Noar, Alexander, North, Samuel, Nwolu, Favour, O’Docherty, Alice, Odutola, Omoteniola, O’Dwyer, Sinead, Ogochukwu, Olebu, O’Mahony, Catherine, Orlando, Lia, Osterdahl, Marc, Page, Christina, Panayotidis, Ismini, Pancholi, Shivam, Parkin, Jessica, Passby, Lauren C, Pastor-Pérez, Patricia, Patel, Harnish, Patel, Shefali, Penfold, Rose, Perinpanathan, Rupini, Perivoliotis, Konstantinos, Perra, Teresa, Pinkney, Martha, Pinotti, Enrico, Porcu, Alberto, Price, Angeline, Pugliese, Francesco, Puri, Prabhleen, Pytraczyk, Sylvia, Qaiser, Yusra, Qurashi, Maria, Radenkovic, Dina, Rajeswaran, Thurkka, Rapaport, Sarah F, Razzak, Tahmina, Reilly, Lara, Reynolds, Paul, Richardson, Alexandra, Roberts, Amelia, Roberts-Rhodes, Charlotte, Robinson, Tanya, Rocca, Aldo, Ross-Skinner, Emily, Ruiz-Marín, Miguel, Ryall, Rebecca, Saad, Alshaimaa M, Saad, Mahmoud M, Sadiq, Ambreen, Sammarco, Giuseppe, Sampanis, Michail A, Sanghvi, Hazel, Sapienza, Paolo, Sayers, Ross, Scott, Luca, Sen, Michael, Shaban, Mosab A A, Shakespeare, Kathleen T, Shaw, Ellie, Shaw, Hannah, Sheldrake, Jonathan, Sim, Sing Yang, Simonelli, Luigi, Sipsas, Nikolaos V, Sivam, Jarita, Sivarajan, Sri, Smith, Jennifer, Speranza, Fabio, Spice, Claire, Stafford, Amanda, Stambollouian, Katharine, Stevens, Kent A, Stewart, Jack, Stratton, Emma, Street, Hannah, Surtees, Michael, Swinnerton, Emma, Taher, Ahmed S A, Tait, Caroline, Taylor, Amybel, Thake, Miriam, Thin, Katie, Thould, Hannah, Thyn, Thyn, To, Benjaman, Tobiss, Hannah, Toppley, Kathryn, Townsend, Liam, Tullo, Ellen, Tzovaras, George, Umeadi, Anthony, Vaidya, Hrisheekesh, Valero-Soriano, María, Varden, Rosanna, Vergani, Vittoria, Vervoort, Dominique, Vescio, Giuseppina, Vettasseri, Mark, Virk, Madiha, Vyas, Vaishali, Wagland, Joanne, Wallis, Stephanie, Warner, Chloe, Watkins, Eleanor, Watson, Hannah, Webb, Rachael, Welsh, Sarah H, West, Ruth, Whelan, Elisha, Whitney, Julie, Whitsey, Mark, Wilcock, Catherine, Wilkinson, Iain, Williams, David, Williamson, Megan, Willott, Ruth H, Wimalasundera, Mettha, Win, Yu Lelt, Winter, Laura, Worrall, Stephanie, Wright, Rebecca, Yeo, Natalie, Yeung, Eirene, Yigit, Merve, Yildiz, Yasin A, Yusuf, Humza, Zambon, Martina, Zaw, Hein, and Elabedeen, Omar Zein
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Male ,Aging ,medicine.medical_specialty ,Frail Elderly ,COVID-19 ,delirium ,frailty ,mortality ,transitions of care ,Cohort Studies ,AcademicSubjects/MED00280 ,Interquartile range ,Internal medicine ,medicine ,Dementia ,Humans ,Survivors ,Aged ,Proportional hazards model ,business.industry ,SARS-CoV-2 ,Hazard ratio ,Odds ratio ,General Medicine ,medicine.disease ,Confidence interval ,frailty,COVID-19 ,Ageing ,Delirium ,Female ,medicine.symptom ,Geriatrics and Gerontology ,business ,Cohort study ,Research Paper - Abstract
Introduction Increased mortality has been demonstrated in older adults with coronavirus disease 2019 (COVID-19), but the effect of frailty has been unclear. Methods This multi-centre cohort study involved patients aged 18 years and older hospitalised with COVID-19, using routinely collected data. We used Cox regression analysis to assess the impact of age, frailty and delirium on the risk of inpatient mortality, adjusting for sex, illness severity, inflammation and co-morbidities. We used ordinal logistic regression analysis to assess the impact of age, Clinical Frailty Scale (CFS) and delirium on risk of increased care requirements on discharge, adjusting for the same variables. Results Data from 5,711 patients from 55 hospitals in 12 countries were included (median age 74, interquartile range [IQR] 54–83; 55.2% male). The risk of death increased independently with increasing age (>80 versus 18–49: hazard ratio [HR] 3.57, confidence interval [CI] 2.54–5.02), frailty (CFS 8 versus 1–3: HR 3.03, CI 2.29–4.00) inflammation, renal disease, cardiovascular disease and cancer, but not delirium. Age, frailty (CFS 7 versus 1–3: odds ratio 7.00, CI 5.27–9.32), delirium, dementia and mental health diagnoses were all associated with increased risk of higher care needs on discharge. The likelihood of adverse outcomes increased across all grades of CFS from 4 to 9. Conclusion Age and frailty are independently associated with adverse outcomes in COVID-19. Risk of increased care needs was also increased in survivors of COVID-19 with frailty or older age.
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- 2021
78. Role of AScorbic acid Infusion in critically ill patients with Transfusion Related Acute Lung Injury (ASTRALI)
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kassem, Amira, primary, Ahmed, Islam, additional, Omran, Gamal, additional, Megahed, Mohamed, additional, and Habib, Tamer, additional
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- 2021
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79. Hepatic Pseudolipoma: A Rare Case
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Esmaeil, Mazen, primary, Ahmed, Ahmed K, additional, Elkhair, Ahamed M, additional, Ahmed, Islam, additional, and Haithrous, Shamim, additional
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- 2021
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80. Simulation of drop impact on substrate with micro-wells
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Ahmed Islam, Mark Sussman, Hui Hu, and Yongsheng Lian
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Fluid Flow and Transfer Processes ,Mechanics of Materials ,Mechanical Engineering ,Computational Mechanics ,Condensed Matter Physics - Abstract
In this paper, we numerically investigate drop impact on a micro-well substrate to understand the phenomena of non-wettability. The simulation is carried out by solving three-dimensional incompressible Navier–Stokes equations using a density projection method and an adaptive grid refinement algorithm. A very sharp interface reconstruction algorithm, known as the moment-of-fluid method, is utilized to identify the multi-materials and multi-phases present in the computation domain. Our simulations predicted that a micro-well with a deep cavity can significantly reduce a solid–liquid contact in the event of drop impact. The results from the drop impact on the micro-well substrate are compared with results from drop impact on a flat substrate. Significant differences are observed between these two cases in terms of wetted area, spreading ratio, and kinetic energy. Our simulation shows that under the same conditions, a drop is more apt to jump from a micro-well substrate than from a flat surface, resulting in smaller wetted area and shorter contact time. Based on the simulation results, we draw a drop jumping region map. The micro-well substrate has a larger region than the flat surface substrate. Finally, we present a comparative analysis between a flat substrate and a substrate constructed with a dense array of micro-wells and, therefore, show that the array of micro-wells outperforms the smooth substrate with regard to non-wettability and drop wicking capability.
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- 2022
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81. COVID-19 related leukoencephalopathy with bilateral reticular formation involvement
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Ahmed, Islam Ahmed Hassan, primary, Aker, loai, additional, Sharafeldin, Mamdouh, additional, Own, Ahmed, additional, Abdelhady, Mohamed, additional, and Vattoth, Surjith, additional
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- 2021
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82. The Postnatal Growth and Retinopathy of Prematurity Model: A Multi-institutional Validation Study
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Ahmed, Islam S. H., primary, Aclimandos, Wagih, additional, Azad, Nadia, additional, Zaheer, Naima, additional, Barry, John Sebastian, additional, Ambulkar, Hemant, additional, Badeeb, Adham, additional, Osman, Ihab Mohamed, additional, Rashad, Shaheera, additional, and Helaly, Hany Ahmed, additional
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- 2021
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83. Peribulbar block for retinal surgery comparison among dexmedetomidine, fentanyl, and local anesthesia.
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Abu-Elwafa, Wesam A., Ahmed, Islam M., Abdul-Aziz, Salah-Eldin A., and Hassan, Ahmed H.
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DEXMEDETOMIDINE , *FENTANYL , *RETINAL surgery , *LOCAL anesthesia , *OPHTHALMOLOGY - Abstract
Introduction Among all the regional blocks, the peribulbar block is one of the most popular for most ophthalmic procedures as it has few complications. Aim To study the effects of mixing local anesthetic with either dexmedetomidine or fentanyl in the peribulbar block for vitreoretinal surgery. Patients and methods The study included 40 adult patients (ASA II-IV) who had a peribulbar block for elective retinal surgery at Sohag University Hospital. All patients received the following combination: lidocaine 2%, bupivacaine 0.5%, hyaluronidase 15 IU/Ml, in addition to either 20 µg of fentanyl (group F) or 20 μg of dexmedetomidine (group D). The duration of postoperative analgesia, the onset, and duration of sensory and motor blocks, along with other complications, were recorded. Results The onset time of motor and sensory blocks was significantly longer in group F. For the duration of sensory and motor blocks, group D had a significantly greater duration than group F (P=0.05). Group D took substantially longer to request analgesia than group F (P=0.0002). Total paracetamol consumption was substantially higher in group F than in group D (P=0.001). The overall number of patients who required nalbuphine was substantially higher in group F (P=0.003) than in group D. At 2, 4, and 6 h postoperatively, the visual analog scale was statistically significantly greater in group F than in group D. Conclusion Dexmedetomidine-local anesthetic mixture in the peribulbar block for retinal surgery was superior to fentanyl-local anesthetic mixture regarding onset and duration of motor, sensory block, postoperative analgesia, and analgesic requirement. [ABSTRACT FROM AUTHOR]
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- 2022
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84. Arabic translation and revalidation of the Lacrimal system symptom questionnaire for recording outcome in adult lacrimal surgery.
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Ahmed, Islam, Idriss, Hesham, Ashry, Mona, and Massry, Youssef
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LACRIMAL apparatus , *CLASSICAL test theory , *INTRACLASS correlation , *CRONBACH'S alpha , *OPHTHALMIC surgery , *PATIENT satisfaction - Abstract
Purpose To provide an Arabic translated, cross-culturally adapted version of the Lacrimal System Questionnaire (Lac-Q) and to validate the translated version. Materials and methods Arabic translation of the Lac-Q passed four stages: forward translation of the original English version to Arabic, backward translation to English, comparison of the original and the backward translated versions, and then a final review of the created Arabic version by an expert committee. Revalidation involved asking each participant after signing an informed consent to complete the Arabic version of the Lac-Q preoperatively, 6 and 12 weeks postoperatively. The surgical success was assessed 12 weeks postoperatively by Jones test 1 and by asking the patients to complete a satisfaction form with the surgical outcome. The patient reported being 'satisfied' or 'not satisfied' according to the improvement of the symptoms and if he/she believed further treatment was required. Results The Arabic version of the questionnaire was completed by 39 patients, where 11 of them had bilateral surgery done in the same sitting. We found a statistically significant positive correlation between patients' social and eye symptom scores (preoperatively and 6 and 12 weeks postoperatively). Good internal consistency and test–retest reliability were confirmed by calculated Cronbach's alpha and intraclass correlation coefficient, respectively. In addition, good discriminative validity was confirmed by a statistically significant difference between the scores of the diseased eye before the surgery and the eyes treated surgically. The score difference between the patients with successful and failed surgeries was statistically significant confirming good responsiveness of the studied version. Conclusion The Arabic version of the Lac-Q is a valuable tool to assess the lacrimal symptoms. [ABSTRACT FROM AUTHOR]
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- 2022
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85. Comparative study between different approaches for the management of postdural puncture headache.
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Hassan, Ahmed H., Refaie, Bahaa M., Ahmed, Islam M., and Abdelkareem, Ayman M.
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BUPIVACAINE ,LIDOCAINE ,HEADACHE ,PTERYGOPALATINE ganglion ,ANESTHESIA - Abstract
Introduction The postdural puncture headache (PDPH) is one of the spinal and epidural anesthesia complications. It can be induced by using large gauge-cutting needles or performing numerous trials. Conservative treatment was the primary option for the management of PDPH, sphenopalatine ganglion block (SPGB) can be a suitable and safe option for the treatment of PDPH. Aim The aim was to verify the efficacy and safety of transnasal SPGB using either lidocaine 2% or bupivacaine 0.5% as a treatment line for PDPH versus the conventional conservative treatment. Patients and methods In total, 120 patients with PDPH following cesarean section under spinal anesthesia were assigned and divided into three groups. Group L (n=40) received transnasal SPGB (lidocaine 2%), group B (n=40) received transnasal SPGB (bupivacaine 0.5%), and group C (n=40) received conservative treatment for 24 h [intravenous (IV) paracetamol 1 g/8 h]. The headache severity was measured by the visual analog scale (VAS) at 0 min, 30 min, 6 h, 12 h, and 24 h post treatment. Results No significant difference in the VAS from the baseline between the groups L and B was observed. VAS values were significantly lower in both groups when compared with patients in group C (P<0.05). No significant differences from baseline mean blood pressure, heart rate, or other complications (such as bleeding), were observed between the three groups at any timepoint. Conclusion The headache severity in PDPH cases might be reduced more efficiently through SPGB using either lidocaine or bupivacaine, unlike other conservative treatments such as paracetamol. [ABSTRACT FROM AUTHOR]
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- 2022
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86. Efficient VANET safety message delivery and authenticity with privacy preservation
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Mohamed, Taha M., primary, Ahmed, Islam Z., additional, and Sadek, Rowayda A., additional
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- 2021
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87. On the Discretization of the Power-Law Hemolysis Model
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Mohammad M. Faghih, M. Keith Sharp, and Ahmed Islam
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Discretization ,business.industry ,Models, Cardiovascular ,Biomedical Engineering ,Mechanics ,Computational fluid dynamics ,Hemolysis ,Power law ,Exponential function ,Exponential growth ,Physiology (medical) ,Convergence (routing) ,Hydrodynamics ,Exponent ,Computer Simulation ,Streamlines, streaklines, and pathlines ,business ,Mathematics - Abstract
Flow-induced hemolysis remains a concern for blood-contacting devices, and computer-based prediction of hemolysis could facilitate faster and more economical refinement of such devices. While evaluation of convergence of velocity fields obtained by computational fluid dynamics (CFD) simulations has become conventional, convergence of hemolysis calculations is also essential. In this paper, convergence of the power-law hemolysis model is compared for simple flows, including pathlines with exponentially increasing and decreasing stress, in gradually expanding and contracting Couette flows, in a sudden radial expansion and in the Food and Drug Administration (FDA) channel. In the exponential cases, convergence along a pathline required from one to tens of thousands of timesteps, depending on the exponent. Greater timesteps were required for rapidly increasing (large exponent) stress and for rapidly decreasing (small exponent) stress. Example pathlines in the Couette flows could be fit with exponential curves, and convergence behavior followed the trends identified from the exponential cases. More complex flows, such as in the radial expansion and the FDA channel, increase the likelihood of encountering problematic pathlines. For the exponential cases, comparison of converged hemolysis values with analytical solutions demonstrated that the error of the converged solution may exceed 10% for both rapidly decreasing and rapidly increasing stress.
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- 2020
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88. Utilization of Cement Kiln Dust (CKD) with Silica Fume (SF) as a Partial Replacement of Cement in Concrete Production
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Rafik Khairy Abdelwahab, Mohammed Taha Nooman, Arafa Elsayed Elhelloty, and Ahmed Islam M. Abdullah
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Cement ,symbols.namesake ,Materials science ,Silica fume ,Flexural strength ,Bond strength ,Ultimate tensile strength ,symbols ,Young's modulus ,Composite material ,Concrete slump test ,Cement kiln - Abstract
This research aimed to clarify the role of by-product materials, such as CKD with SF as partial replacement by weight of cement in concrete manufacturing and inclusion on different characteristics of concrete. Concrete test specimens were mixed with 0%, 5%, 10%, 15%, 20% and 25% (CKD) with 15% (SF) as partial replacement by weight of Cement (CEM I-52.5N). Fresh concrete properties have been evaluated by workability measurement slump test. While hardened concrete properties have been evaluated by compressive, split tensile and flexural strengths tests at ages 7, 28 and 56 days, but evaluated for bond strength, modulus of elasticity and chemical composition measurement with X-Ray Fluorescence at age of 28 days. The test results have revealed that the increase of CKD amount with fixed amount of SF in concrete mixtures as partial replacement by weight of cement leads to gradual decrease of fresh concrete workability. In concrete mixtures, 20% CKD in the presence of 15% SF as partial replacement by the weight of cement are the optimum ratios which can be used without any negative effect on mechanical properties compressive, indirect tensile, flexural and bond strength at all the ages of concrete. Also modulus of elasticity and bond strength increased by 8.81% and 0.69% respectively at the age 28 days compared with control mixture.
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- 2019
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89. HYP-FAST trial study protocol: a phase II, single-center, open-label RCT comparing the effect of early time-restricted feeding on blood pressure control versus standard of care in individuals with primary hypertension
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Valentini, Agustina, primary, Eduardo Loyola, Jose, additional, Inglez, Joice, additional, Ferreira, Roseanne, additional, Souza, Jonas, additional, Santana-Guerrero, Juan, additional, Yucuma, Daniela, additional, Liutti, Vitor, additional, Abdelrahman, Salma, additional, Pirazzoli, Michelle, additional, Kaegi-Braun, Nina, additional, Reyes, Hans, additional, Ahmed, Islam, additional, Elhiday, Hiba, additional, Guimaraes, Andrea, additional, Oller, Joel, additional, Friend, Mary, additional, Sanches, Jessica, additional, Sierra Mencia, Alvaro, additional, Kann, Ariel, additional, and Rosa, Michelle, additional
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- 2021
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90. Pediatric Keratoconus in A Tertiary Eye Center in Alexandria: A Cross-sectional Study
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Mahmoud, Shahira, primary, El-Massry, Ahmed, additional, Goweida, Mohamed Bahgat, additional, and Ahmed, Islam, additional
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- 2021
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91. The Postnatal Growth and Retinopathy of Prematurity Model: A Multi-institutional Validation Study.
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Ahmed, Islam S. H., Aclimandos, Wagih, Azad, Nadia, Zaheer, Naima, Barry, John Sebastian, Ambulkar, Hemant, Badeeb, Adham, Osman, Ihab Mohamed, Rashad, Shaheera, and Helaly, Hany Ahmed
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MODEL validation , *PREMATURE infants , *BIRTH weight , *WEIGHT gain , *GESTATIONAL age , *RETROLENTAL fibroplasia - Abstract
The G-ROP model was proposed to improve the retinopathy of prematurity (ROP) screening efficiency. It is based on gestational age, birth weight and postnatal weight gain. The current study aimed to validate the G-ROP model's ability to predict ROP in cohorts of premature infants from Egypt and the United Kingdom (UK). We retrospectively reviewed the records of preterm infants born between 1st of January and 30th of June 2018 with a known outcome for ROP screening and regular weight measurements until day 39 after birth. We applied the G-ROP model to the study group and calculated the sensitivity of the model for detecting Early Treatment of ROP (ETROP) study type 1 ROP and for any ROP and calculated the reduction of the number of infants requiring ROP screening by the model application. We applied the G-ROP model on 605 infants (504 from Egypt and 101 from the UK). The model successfully predicted all type 1 ROP cases (100% sensitivity) in both cohorts (95% confidence interval [CI], 91.1–100% in the Egyptian cohort and 65.5–100% in the UK cohort). The model reduced the number of infants requiring screening by 14.1% in the Egyptian cohort and 21.8% in the UK cohort. The G-ROP model was successfully validated for detecting type 1 ROP and in both cohorts from Egypt and the UK. [ABSTRACT FROM AUTHOR]
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- 2022
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92. Deficit Irrigation Technique to Improve Water Productivity of Avocado Grown on Mulched Sandy Soil.
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Sokkar, Mostafa A., Ahmed, Islam F., Ibrahim, Ahmed A., Mubarak, Manal M., and Nossier, Mona I.
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DEFICIT irrigation , *AVOCADO , *SANDY soils , *PHYSIOLOGY , *CROPS - Abstract
A field experiment was conducted in new reclaimed areas to improve avocado trees water productivity cultivated under deficit irrigation and mulching. The deficit irrigation treatments were 90, 80, 70, and 60% of reference evapotranspiration (ETo). Results revealed that The average water requirements during different avocado trees physiological growth stages were 613, 1509, 1755, 1391, and 632 m³ /fed for flowering to end of fruit set, fruit set to approximately 50% of the expected market fruit size, during the fruit growth stage, during the fruit ripening stage, and during the flower bud formation stage, respectively. These values represent approximately 10.4%, 25.6%, 29.7%, 23.6%, and 10.7% of the total yearly water requirement. The averages irrigation frequency were 2.45, 2.61, 2.72, 2.87, and 3.91day for 100, 90, 80, 70 and 60% ETo treatments, respectively. The highest crop water productivity value of 1.24 kg/m³ water was attained at 70% ETo followed by 1.18 kg/m³ water at 80% ETo while the least crop water productivity (1.06 kg/m³ water) was realized at 100% ETo. The crop water requirement of 5110 m³ /fed/year with high irrigation frequency is recommended for mulched sandy soil cultivated with avocado trees. [ABSTRACT FROM AUTHOR]
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- 2022
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93. Association of Apolipoprotein A1 Gene Polymorphism and Coronary Heart Diseases in Patients with Type 2 Diabetes Mellitus
- Author
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Rashad, Nearmeen M., primary, Ebrahem, Gehan A., additional, El-Shal, Amal S., additional, Abo- Zenar, Mohamed R. H., additional, Ahmed, Islam G., additional, and Hamed, Mohamed G., additional
- Published
- 2021
- Full Text
- View/download PDF
94. Prevalence of elevated anxiety symptoms among children in quarantine with COVID-19 infection in the State of Qatar: A cross-sectional study
- Author
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Khan, Yasser Saeed, primary, Khan, Abdul Waheed, additional, Noureldin Ahmed, Islam Ahmed, additional, Hammoudeh, Samar, additional, Salim, Halla, additional, AbuKhattab, Mohammed, additional, Al-Maslamani, Muna A Rahman S, additional, Zainel, Abdulwahed, additional, Salameh, Sarah Nidal, additional, and Alabdulla, Majid, additional
- Published
- 2021
- Full Text
- View/download PDF
95. Spectrum of neuroimaging findings in COVID-19
- Author
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El Beltagi, Ahmed H, primary, Vattoth, Surjith, additional, Abdelhady, Mohamed, additional, Ahmed, Islam, additional, Paksoy, Yahya, additional, Abou Kamar, Mohamed, additional, Alsoub, Hussam, additional, Almaslamani, Muna, additional, Alkhal, Abdul Latif, additional, Own, Ahmed, additional, and Elsotouhy, Ahmed, additional
- Published
- 2021
- Full Text
- View/download PDF
96. Management of carotid artery disease in the elderly
- Author
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Ahmed, Islam, Jibawi, Abdullah, Barkat, Mohamed, Sakka, Karim El, and Yusuf, Syed Waquar
- Published
- 2011
- Full Text
- View/download PDF
97. Cardiac Dysfunction and Serum Ferritin Level as Early Prognostic Markers in Children with Sepsis.
- Author
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Mahmoud, Nagwa Mohamed Sabry Abdelsalam, primary, Ismail, Ahlam M., additional, Elela, Moustafa Ahmed El Sayed Ahmed Abu, additional, and Ahmed, Islam nashaat roshdy, additional
- Published
- 2020
- Full Text
- View/download PDF
98. Determinants of Anticoagulation Control in Patients Receiving Warfarin Therapy
- Author
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Al-Shaer, Mohammad Hossam Eldeen, primary, Mohammad, Mohammad Gouda, additional, Ahmed, Islam Galal Sayed, additional, and Ibrahim, Ahmed Mohammed Badawy, additional
- Published
- 2020
- Full Text
- View/download PDF
99. Functional Verification of Dynamic Partial Reconfiguration for Software-Defined Radio
- Author
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Ahmed, Islam, primary, Mohieldin, Ahmed Nader, additional, and Mostafa, Hassan, additional
- Published
- 2020
- Full Text
- View/download PDF
100. Prognostic value of systematic lymphadenectomy in patients with ovarian cancer: A systematic review and meta-analysis
- Author
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AlMahdy, AlBatool, primary, Elassall, Gena, additional, Abdelbadee, Ahmed, additional, Elkariem, Ahmed Yassien Abd, additional, Atef, Fatma, additional, Ahmed, Islam, additional, Sayed, Esraa, additional, Ashraf, Mohamed, additional, Ali, Ahmed, additional, Ragab, Esraa, additional, Elazeem, Hossam Aldein Abd, additional, Saad, Mahmoud, additional, and Shazly, Sherif, additional
- Published
- 2020
- Full Text
- View/download PDF
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