?:authorAffiliation
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[\'Clinic of Gastroenterology, Tsaritsa Yoanna University Hospital, Medical University of Sofia, Sofia, Bulgaria.\', \'Department of Gastroenterology, Pulmed University Hospital, Plovdiv, Bulgaria.\', \'Department of Hygiene and Epidemiology, Medical University of Varna, Varna, Bulgaria.\', \'Department of Gastroenterology and Hepatology, University Hospital Zürich, Zürich, Switzerland.\', \'Digestive Function: Basel, Laboratory and Clinic for Motility Disorders and Functional Digestive Diseases, Center for Integrative Gastroenterology, Arlesheim, Switzerland.\']
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