1 Center for Surgery, Department of General and Visceral Surgery, Center for Bariatric and Metabolic Surgery, Medical Center - University of Freiburg, Hugstetter Strasse 55, 79106, Freiburg, Germany. jodok.fink@uniklinik-freiburg.de.
2 Center for Surgery, Department of General and Visceral Surgery, Center for Bariatric and Metabolic Surgery, Medical Center - University of Freiburg, Hugstetter Strasse 55, 79106, Freiburg, Germany.