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Intermittent severe abdominal pain is a medical emergency with multiple possible underlying causes. This case report describes a 30-year-old female experiencing severe pelvic pain alternating between the left and right lower abdomen. The pain was periodic and very intense. She also experienced intermittent, vague pain in the upper abdomen. Clinical examination and imaging suggested torsion and detorsion of an ovarian fibroma or dysgerminoma. Additionally, a distended dolichocolon was seen in the upper abdomen. Laparoscopy revealed a twisted and enlarged right ovary in the pelvis. In the upper abdomen, a distended dolichocolon was observed along with a twisted, black spleen. The blood vessels of the wandering spleen hung over the colon like a rubber band, causing constriction. The ovary was removed and diagnosed as a cellular fibroma after histopathological examination. Attempts to untwist the spleen laparoscopically were unsuccessful, so a mini-laparotomy was performed to manually untwist it. Afterward, the spleen regained its normal position and color. Due to the significantly elongated dolichosigmoid, which could cause further complications, the affected segment was removed and a reanastomosis was performed. At the end of the procedure, the spleen remained stable in its original position with a healthy coloration. In retrospect, this patient experienced intermittent twisting of the ovary and spleen over an 18-month period, causing severe abdominal pain. The key lessons from this case are to take abdominal pain seriously, thoroughly examine all areas during surgery, and avoid stopping the investigation after identifying a single issue. A critical approach is essential to pinpointing the cause of each specific symptom, as one pathology may not always explain all observed symptoms. This comprehensive approach ultimately saved the patient's spleen., Competing Interests: Human subjects: Consent was obtained or waived by all participants in this study. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2024, Dreesen et al.)

Background: Out-of-hours primary care (OOH-PC) has emerged as a promising solution to improve efficiency, accessibility, and quality of care and to reduce the strain on emergency departments. As this modality gains traction in diverse healthcare settings, it is increasingly important to fully assess its societal value-for-money and conduct thorough process evaluations. However, current economic evaluations mostly emphasise direct- and short-term effect measures, thus lacking a broader societal perspective., Aim: This study offers a comprehensive overview of current effect measures in OOH-PC evaluations and proposes additional measures from the evaluation of integrated care programmes., Approach and Development: First, we systematically identified the effect measures from published cost-effectiveness studies and classified them as process, outcome, and resource use measures. Second, we elaborate on the incorporation of 'productivity gains', 'health promotion and early intervention', and 'continuity of care' as additional effects into economic evaluations of OOH-PC. Seeking care affects personal and employee time, potentially resulting in decreased productivity. Challenges in taking time off work and limited access to convenient care are often cited as barriers to accessing primary care. As such, OOH-PC can potentially reduce opportunity costs for patients. Furthermore, improving access to healthcare is important in determining whether people receive promotional and preventive services. Health promotion involves empowering people to take control of their health and its determinants. Given the unscheduled nature and the fragmented or rotational care in OOH-PC, the degree to which interventions and modalities provide continuity should be monitored, assessed, and included in economic evaluations. Continuity of care in primary care improves patient satisfaction, promotes adherence to medical advice, reduces reliance on hospitals, and reduces mortality., Conclusion: Although it is essential to also address local settings and needs, the integration of broader scope measures into OOH-PC economic evaluations improves the comprehensive evaluation that aligns with welfare gains.

Background: A total of 7,307 Ukrainian refugees moved to Antwerp, Belgium, during the study period (01 April 2022 to 31 December 2022). The city's administration set up three care centers where these people were introduced to the Belgian primary care system, a medical file was created, and acute/preventive/chronic care was delivered. This community case study analyzes the organization and contents of care and reflects upon its meaning for the mainstream healthcare system., Methods: This is an observational study using routine electronic medical record data to measure the uptake of care. For a sample of 200 subjects, a retrospective chart review was conducted., Participants: All refugees with a medical file at one of the three participating care centers were included., Main Outcomes: For the observational study, 2,261 patients were reached (30% of the potential users), and 6,450 contacts were studied. The nurses (including midwives) conducted 4,929 out of 6,450 (76%) of all consultations, while the general practitioners (GPs) conducted 1,521 out of 6,450 (24%). Of the nurse consultations, 955 (19%) were followed by another nurse consultation and 866 (18%) by a GP consultation. In the structured case reviews, most contacts were concerned with acute problems (609 out of 1,074, 57%). The most prevalent reasons for encounters and diagnoses were typical primary care issues. The nurses were able to manage half of the cases independently (327, 55%), referred 37% (217) of cases to the GP, and consulted a GP (live, by telephone, or a dedicated app) for 8% (48) of cases. GPs mostly prescribed drugs, referred to a medical specialist, and advised over-the-counter drugs, while nurses more often advised over-the-counter drugs (mostly paracetamol, nose sprays, and anti-inflammatory drugs), provided non-medical advice, or ordered laboratory tests., Discussion: The medical care points delivered mostly typical acute primary care in this first phase, with a key role for nurses. The care points did not sufficiently take up chronic diseases and mental health problems. These results will inform policymakers on the use of primary care centers for newly arriving patients in times of a large influx. A nurse-first model seems feasible and efficient, but evaluation of safety and quality of care is needed. Once the acute phase of this crisis fades away, questions about the comprehensiveness, continuity, and integration of care for migrants remain relevant., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Morreel, Verhoeven, Bastiaens, Monten and van Olmen.)

Recently developed chatbots based on large language models (further called bots) have promising features which could facilitate medical education. Several bots are freely available, but their proficiency has been insufficiently evaluated. In this study the authors have tested the current performance on the multiple-choice medical licensing exam of University of Antwerp (Belgium) of six widely used bots: ChatGPT (OpenAI), Bard (Google), New Bing (Microsoft), Claude instant (Anthropic), Claude+ (Anthropic) and GPT-4 (OpenAI). The primary outcome was the performance on the exam expressed as a proportion of correct answers. Secondary analyses were done for a variety of features in the exam questions: easy versus difficult questions, grammatically positive versus negative questions, and clinical vignettes versus theoretical questions. Reasoning errors and untruthful statements (hallucinations) in the bots' answers were examined. All bots passed the exam; Bing and GPT-4 (both 76% correct answers) outperformed the other bots (62-67%, p = 0.03) and students (61%). Bots performed worse on difficult questions (62%, p = 0.06), but outperformed students (32%) on those questions even more (p<0.01). Hallucinations were found in 7% of Bing's and GPT4's answers, significantly lower than Bard (22%, p<0.01) and Claude Instant (19%, p = 0.02). Although the creators of all bots try to some extent to avoid their bots being used as a medical doctor, none of the tested bots succeeded as none refused to answer all clinical case questions.Bing was able to detect weak or ambiguous exam questions. Bots could be used as a time efficient tool to improve the quality of a multiple-choice exam., Competing Interests: The authors have declared that no competing interests exist., (Copyright: © 2024 Morreel et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)

In Antwerp, Belgium's second largest city, a COVID-19 surge in July 2020 predominantly affected neighborhoods with high ethnic diversity. Local volunteers reacted and set up an initiative to support contact tracing and self-isolation. We describe the origin, implementation, and transfer of this local initiative, based on semi-structured interviews of five key informants and document review. The initiative started in July 2020, when family physicians signaled a surge of SARS-CoV-2 infections among people of Moroccan descent. Family physicians feared that the mainstream contact tracing organized by the Flemish government through centralized call centers would not be efficient in halting this outbreak. They anticipated language barriers, mistrust, inability to investigate case clusters, and practical problems with self-isolation. It took 11 days to start up the initiative, with logistical support from the province and city of Antwerp. Family physicians referred SARS-CoV-2-infected index cases with complex needs (including language and social situation) to the initiative. Volunteer COVID coaches contacted cases, got a contextualized understanding of their living conditions, assisted with backward and forward contact tracing, offered support during self-isolation, and checked if infected contacts also needed support. Interviewed coaches were positive about the quality of the interaction: they described extensive open conversations with cases. The coaches reported back to referring family physicians and coordinators of the local initiative, who took additional action if necessary. Although interactions with affected communities were perceived as good, respondents considered that the number of referrals by family physicians was too low to have a meaningful impact on the outbreak. In September 2020, the Flemish government assigned the tasks of local contact tracing and case support to the local health system level (primary care zones). While doing so, they adopted elements of this local initiative, such as COVID coaches, tracing system, and extended questionnaires to talk with cases and contacts. This community case study illustrates how urgency can motivate people to action yet support from people with access to resources and coordination capacity is vital for effective organization and transition to long-term sustainability. From their conception, health policies should consider adaptability of new interventions to local contexts., Competing Interests: SM worked as a FP in the involved community and was board member of a local FP organization. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Verdonck, Morreel, Vanhamel, Vuylsteke, Nöstlinger, Laga and van Olmen.)

Background: During the TRIAGE trial, emergency nurses diverted 13.3% of patients with low-risk complaints from a Belgian emergency department (ED) to the adjacent general practitioner cooperative (GPC). We examined the effects of this diversion on the total cost, insurance costs and patient costs, as charged on the invoice. Changes in the cost composition and the direct impact on revenues of both locations were examined as a secondary objective., Methods: The differences in costs between intervention and control weekends were tested with two-sample t-tests and Kolmogorov-Smirnov (KS) tests. For the main outcomes an additional generalised linear model was created. Proportions of patients charged with certain costs were examined using Pearson's chi-square tests. Average revenues per weekend were compared using pooled t-tests., Results: During intervention weekends, total costs increased by 3% (€3.3). The costs decreased by 8% (€2.2) for patients and increased by 6% (€5.5) for insurance, mainly driven by differences in physician fees. More patients were charged a consultation fee only (25% vs. 19%, p-value<0.01). The GPC's revenues increased by 13% (p-value=0.06); no change was found for the ED's revenues., Conclusion: The intervention reduced costs slightly for patients, while total costs and insurance costs slightly increased. When implementing triage systems with primary care involvement, the effects on the costs and revenues of the stakeholders should be monitored., Competing Interests: Declaration of Competing Interest SM is a general practitioner working in the surroundings of the study site, and as such, he performed on call shifts at the study site and treated some of the studied patients. Due to the anonymity of the studied data, the exact number of study patients seen by him cannot be determined, but it was below ten. He is also a board member of the studied general practice cooperative receiving meeting fees. HP is coordinator of the iCAREdata project. She had an appointment at the University of Antwerp for this project until September 2020. The authors declare no other relationships or activities that could have influenced the submitted work., (Copyright © 2022. Published by Elsevier B.V.)

Aims: This process evaluation aims at identifying the facilitators and inhibitors that influenced the successful uptake of a nurse-led triage system streaming low-risk patients from an emergency department (ED) to the general practitioner (GP)., Design & Methods: Semi-structured interviews with ED nurses (n = 12), ED doctors (n = 6) from the ED of a Belgian general hospital and GPs (n = 5) affiliated with the adjacent GP cooperative (GPC). The process evaluation ran in parallel with the TRIAGE trial that started in March 2019 and ended 31st of December 2019. The first set of interviews was conducted in June 2019 and the second set in January 2020. Data were analysed based on grounded theory., Results: Through a deductive framework, facilitators and inhibitors could be identified on three levels: the organisational, group and individual level. Main inhibitors are the degree of risk aversion of individual nurses, possible language barriers during delivery of the triage advice and the non-adapted ED infrastructure. Training on both the use of the triage protocol and effective delivery of the triage advice, in combination with periodical feedback from the GPC were the most important facilitators., Conclusion: Based on the process evaluation we can conclude that a consensus exists among stakeholders that the ED Nurses are considered ideally positioned to perform the triage of walk-in patients, although a certain degree of experience is necessary. Although the extended triage protocol and GPC referral increases the complexity and duration of triage and entails a higher workload for the triage nurses, ED nurses found it did lead to a lower (perceived) workload for the ED in general., (Copyright © 2022 Elsevier Ltd. All rights reserved.)

Background: During the cluster randomised TRIAGE-trial, a nurse advised 13% of low-risk patients presenting at an emergency department in Belgium to visit the adjacent general practitioner cooperative. Patients had the right to refuse this advice. This exploratory study examines the characteristics of refusers by uncovering the determinants of non-compliance and its impact on costs, as charged on the patient's invoice., Methods: Bivariate analyses with logistic regressions and T-tests were used to test the differences in patient characteristics, patient status, timing characteristics, and costs between refusers and non-refusers. A chi-square automatic interaction detection analysis was used to find the predictors of non-compliance., Results: 23.50% of the patients refused the advice to visit the general practitioner cooperative. This proportion was mainly influenced by the nurse on duty (non-compliance rates per nurse ranging from 2.9% to 52.8%) and the patients' socio-economic status (receiving increased reimbursement versus not OR 1.37, 95%CI: 0.96 to 1.95). Additionally, non-compliance was associated (at the 0.10 significance level) with being male, not living nearby and certain reasons for encounter. Fewer patients refused when the nurse perceived crowding level as quiet relative to normal, and more patients refused during the evening. The mean cost was significantly higher for patients who refused, which was a result of more extensive examination and higher out-of-pocket expenses at the ED., Conclusions: The nurse providing the advice to visit the general practitioner cooperative has a central role in the likelihood of patients' refusal. Interventions to reduce non-compliance should aim at improving nurse-patient communication. Special attention may be required when managing patients with a lower socio-economic status. The overall mean cost was higher for refusers, illustrating the importance of compliance., Trial Registration: The trial was registered on registration number NCT03793972 on 04/01/2019., (© 2022. The Author(s).)

Objectives: Patients in Belgium needing out-of-hours medical care have two options: the emergency department (ED) or a general practitioner (GP) on call. Currently, there is no triage system in Belgium, so patients do not know where they should go. However, patients who could be managed by a GP frequently present themselves at an ED without referral. GPs often organise themselves in a General Practitioners Cooperative (GPC). This study assesses the accuracy of a newly developed telephone triage guideline., Methods: Observational real-time simulation: all walk-in patients at two GPCs and three EDs were asked to call a triage telephone number with their current medical problem. The operator handling this call registered an urgency level and a resource (ED, GP or ambulance) to deploy. The treating physician's opinion was used a the gold standard for correct triage. Patients were not informed about the outcome of the triage and continued the standard care path they had chosen., Results: The overall sensitivity of the telephone triage for detecting patients who could be managed by a GP was 82% with a specificity of 53%. The correctness of the advice given by the operator according to the physicians was 71%, with 12% underestimation of urgency and 17% overestimation. At the GPC, the sensitivity for detecting patients requiring GP management/care was 91% with a specificity of 36%. At the ED, the sensitivity for detecting GP patients was 67% with a specificity of 48%., Conclusion: This study evaluates a new guideline for telephone triage, showing potential overtriage for patients wanting to attend the GPC, with possible inefficiency, and potential undertriage for patients wanting to attend the ED, with possible safety issues.

Antibiotic overprescribing is one of the main drivers of the global and growing problem of antibiotic resistance, especially in primary care and for respiratory tract infections (RTIs). RTIs are the most common reason for patients to consult out-of-hours (OOH) primary care. The COVID-19 pandemic has changed the way general practitioners (GPs) work, both during office hours and OOH. In Belgian OOH primary care, remote consultations with the possibility of issuing prescriptions and telephone triage were implemented. We aimed to describe the impact of COVID-19 on GPs' antibiotic prescribing during OOH primary care. In an observational study, using routinely collected health data from GP cooperatives (GPCs) in Flanders, we analyzed GPs' antibiotic prescriptions in 2019 (10 GPCs) and 2020 (20 GPCs) during OOH consultations (telephone and face-to-face). We used autoregressive integrated moving average (ARIMA) modeling to identify any changes after lockdowns were implemented. In total, 388,293 contacts and 268,430 prescriptions were analyzed in detail. The number of antibiotic prescriptions per weekend, per 100,000 population was 11.47 (95% CI: 9.08-13.87) or 42.9% lower after compared to before the implementation of lockdown among all contacts. For antibiotic prescribing per contact, we found a decrease of 12.2 percentage points (95% CI: 10.6-13.7) or 56.5% among all contacts and of 5.3 percentage points (95% CI: 3.7-6.9) or 23.2% for face-to-face contacts only. The decrease in the number of prescriptions was more pronounced for cases with respiratory symptoms that corresponded with symptoms of COVID-19 and for antibiotics that are frequently prescribed for RTIs, such as amoxicillin (a decrease of 64.9%) and amoxicillin/clavulanate (a decrease of 38.1%) but did not appear for others such as nitrofurantoin. The implementation of COVID-19 lockdown measures coincided with an unprecedented drop in the number of antibiotic prescriptions, which can be explained by a decrease in face-to-face patient contacts, as well as a lower number of antibiotics prescriptions per face-to-face patient contact. The decrease was seen for antibiotics used for RTIs but not for nitrofurantoin, the first-choice antibiotic for urinary tract infections.

Background: Survey studies suggest that COVID-19 has had a negative impact on the population's mental well-being. Routine registration data allow a more objective way for investigating such associations, complementary to self-report measures. This study investigates the level of out of hours (OOH) consultations for psychological problems since the start of the COVID-19 pandemic in Flanders, Belgium. Methods: The iCAREdata database is a clinical research database with routine data of OOH care, covering a large area in Flanders, Belgium. After defining the first wave and the second wave of COVID-19 in Flanders in time, we compared the number of consultations regarding psychological problems (in general, anxiety-related, depression-related, and sleep-related) between those periods, the period in between these waves, and the period before the start of COVID-19. Results: A significant rise in OOH consultations due to psychological-and more specifically, anxiety-related-problems is observed since the start of the COVID-19 pandemic in Flanders. Elevated levels are observed until the second wave. This finding is in sharp contrast with the general pattern of lower demand for primary healthcare during this period. The majority of these supplementary consultations happened by phone. Consultations regarding depression-related problems did not change over time. Sleep disturbances in the OOH setting were more common after the first wave. Conclusion: Despite some limitations, a large Flemish database with routine data on OOH care shows an increase in the number of consultations regarding psychological problems in general and anxiety-related problems since the start of the COVID-19-pandemic until the second wave., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Van den Broeck, Morreel, Glazemakers, Verhoeven, Rens and Philips.)

Objectives: To determine whether a new triage system safely diverts a proportion of emergency department (ED) patients to a general practitioner cooperative (GPC)., Methods: Unblinded randomised controlled trial with weekends serving as clusters (three intervention clusters for each control). The intervention was triage by a nurse using a new extension to the Manchester Triage System assigning low-risk patients to the GPC. During intervention weekends, patients were encouraged to follow this assignment; it was not communicated during control weekends (all patients remained at the ED). The primary outcome was the proportion of patients assigned to and handled by the GPC during intervention weekends. The trial was randomised for the secondary outcome: the proportion of patients assigned to the GPC. Additional outcomes were association of these outcomes with possible confounders (study tool parameters, nurse, and patient characteristics), proportion of patients referred back to the ED by the GPC, hospitalisations, and performance of the study tool to detect primary care patients (the opinion of the treating physician was the gold standard)., Results: In the intervention group, 838/6294 patients (13.3%, 95% CI 12.5 to 14.2) were assigned to the GPC, in the control group this was 431/1744 (24.7%, 95% CI 22.7 to 26.8). In total, 599/6294 patients (9.5%, 95% CI 8.8 to 10.3) experienced the primary outcome which was influenced by the reason for encounter, age, and the nurse. 24/599 patients (4.0%, 95% CI 2.7 to 5.9) were referred back to the ED, three were hospitalised. Positive and negative predictive values of the studied tool during intervention weekends were 0.96 (95%CI 0.94 to 0.97) and 0.60 (95% CI 0.58 to 0.62). Out of the patients assigned to the GPC, 2.4% (95% CI 1.7 to 3.4) were hospitalised., Conclusions: ED nurses using a new tool safely diverted 9.5% of the included patients to primary care., Trial Registration: ClinicalTrials.gov Identifier: NCT03793972., Competing Interests: I have read the journal’s policy and the authors of this manuscript have the following competing interests: The second author is a general practitioner working in the surroundings of the study site, and as such, he performed on call shifts at the study site and treated some of the studied patients. Due to the anonymity of the studied data, the exact number of study patients seen by him cannot be determined, but it was definitely below ten. He is also a board member of the studied general practice cooperative receiving meeting fees. Author HP is coordinator of the iCAREdata project (database used for this study). She had an appointment at the University of Antwerp for this project until September 2020. The authors declare no other relationships or activities that could appear to have influenced the submitted work.

Background: Patients in Belgium needing out-of-hours care have two options: the emergency department or the general practitioner on call often organised in a general practitioner cooperative. Currently, there is no triage system in Belgium so patients do not know where to go., Methods: Our primary objective was to examine the ability of a newly developed telephone guideline, called 1733, to adequately estimate the urgency of health problems presented by simulated patients. Ten clinical vignettes were presented to 12 operators in a simulated phone call. The operators had to assign a protocol, urgency level and resource to dispatch (ambulance, general practitioner house visit, etc.) to each case., Results: A total of 120 phone calls were analysed. The operators chose the right protocol in 69% and the correct urgency level in 35% of the cases. The proportion of under- and over-triage was 26% and 39%, respectively. There was important variation in between the operators. The sensitivity for detecting highly urgent cases was 0.42, the specificity 0.92., Conclusion: Using the new Belgian 1733 guideline for telephone triage, operators mostly chose the appropriate protocol but only chose the correct urgency in one out of three cases. In this phase of development, the studied telephone guideline is not ready for implementation.

Background: During the COVID-19 pandemic, general practitioners worldwide re-organise care in very different ways because of the lack of evidence-based protocols., Objective: This paper describes the organisation and the characteristics of consultations in Belgian out-of-hours primary care during five weekends at the peak of a COVID-19 outbreak and compares it to a similar period in 2019., Methods: Real-time observational study using pseudonymised routine clinical data extracted out of reports from home visits, telephone- and physical consultations (iCAREdata). Nine general practice cooperatives (GPCs) participated covering a population of 1 513 523., Results: All GPCs rapidly re-organised care in order to handle the outbreak and provide a safe working environment. The average consultation rate was 222 per 100 000 citizens per weekend. These consultations were handled by telephone alone in 40% (N = 6293). A diagnosis at risk of COVID-19 was registered in 6692 (43%) consultations,. Out of 5311 physical consultations, 1460 were at risk of COVID-19 of which 443 (30%) did not receive prior telephone consultation to estimate this risk. Compared to 2019, the workload initially increased due to telephone consultations but afterwards declined drastically. The physical consultation rate declined by 45% with a marked decline in diagnoses unrelated to COVID-19., Conclusions: General practitioners can rapidly re-organise out-of-hours care to handle patient flows during a COVID-19 outbreak. Forty percent of the out-of-hours primary care contacts are handled by telephone consultations alone. We recommend to give a telephone consultation to all patients and not to rely on call takers to differentiate between infectious and regular care. The demand for physical consultations declined drastically provoking questions about patient's safety for care unrelated to COVID-19., Competing Interests: I have read the journal's policy and the authors of this manuscript have the following competing interests: All authors have completed the ICMJE uniform disclosure form and declare: Stefan Morreel is an unpaid Board member of one of the participating General Practice Cooperatives and is paid by the Belgian ministry of health to coordinate the response of this cooperative to the COVID-19 pandemic. Veronique Verhoeven has participated at the same GPC by handling telephone calls in a fee-for-service model. All authors are board members of iCAREdata as part of their academic position, the database used in this study. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

Background: Patients in Belgium needing out-of-hours care have two options: the emergency department (ED) or the general practitioner on call. The latter is often organized in a General Practice Cooperative (GPC). At the ED, there is an overload of patients who could be helped more efficiently by the GPC., Research Question: What is the proportion of patients switching from the ED to the GPC (called voluntary switchers) with and without an information campaign? What are the characteristics of these patients?, Methods: Single-center prospective intervention trial during the opening hours of the GPC (only weekends: Friday 7.00 pm to Monday 7.00 am). The first 10 weekends there was no intervention. The next 24 weekends, patients in the ED were informed about the out-of-hours care in Belgium. The information contained several topics: characteristics of both services, where to go using examples, practicalities, and costs. This information was distributed through leaflets and broadcasted on a screen in five languages., Results: During the study period, 7,453 patients entered the ED of which 330 are voluntary switchers. The proportion of voluntary switchers was 1.7 percent before and 5.4 percent after the intervention (p < 0.01). This effect remained stable for 10 more months after the study. The average number of patients presenting at the ED per hour was 3.1, whereas on hours with voluntary switchers was 5.1 (p < 0.01). The age distribution and epidemiological profile of the voluntary switchers resembles the one of primary care patients. The general practicioners (GPs) referred 6 percent of the voluntary switchers back to the ED., Conclusion: Co-location of the GPC and the ED and informing patients is a meaningful step toward a more profound collaboration.