1. Department of Visceral, Transplant, Thoracic and Vascular Surgery, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany
2. Integrated Treatment and Research Centre (IFB) for Obesity Diseases, Philipp-Rosenthal-St. 27, 04103 Leipzig, Germany
3. Department of Internal Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany
4. Department of Anesthesia and Intensive Care Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany