1. Department of General, Visceral, and Transplantation Surgery, Heidelberg University Hospital , Heidelberg , Germany
2. Department of Visceral, Thoracic, and Vascular Surgery, Dresden University Hospital , Dresden , Germany
3. Department of General, Visceral, and Thoracic Surgery, University Hospital Hamburg , Hamburg , Germany
4. Department of General, Visceral, Thoracic, Transplantation, and Paediatric Surgery, University Hospital Schleswig-Holstein , Kiel , Germany
5. Department of Surgery, Israelite Hospital Hamburg , Hamburg , Germany
6. Department of Surgery, University Hospital Charité Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Humboldt-Universität zu Berlin, Berlin , Germany
7. Department of Surgical Oncology and Robotics, Krankenhaus Waldfriede, Charité Teaching Hospital , Berlin , Germany
8. Division of Abdominal Surgery, Clarunis—Academic Centre of Gastrointestinal Diseases, St Clara and University Hospital of Basle , Basle , Switzerland