1. Center for Bariatric and Metabolic Surgery, Center for Innovative Surgery – ZIC, Department of Surgery, Charité – Universitätsmedizin Berlin, Campus Charité Mitte and Campus Virchow-Klinikum, Berlin, Germany
2. Medical Department, Division of Hepatology and Gastroenterology, Interdisciplinary 11 Endoscopy, Charité-Universitätsmedizin Berlin, Berlin, Germany