1. Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
2. Deutsches Zentrum für Diabetesforschung e.V., 85764 Neuherberg, Germany
3. Clinic for Visceral, Transplantation and Thorax and Vascular Surgery, University Hospital Leipzig, 04103 Leipzig, Germany
4. Department of General, Abdominal and Pediatric Surgery, Municipal Hospital, 07548 Gera, Germany
5. Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, 76133 Karlsruhe, Germany
6. Municipal Clinic Dresden-Neustadt, 01129 Dresden, Germany
7. Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany