1. Department of General, Visceral and Vascular Surgery, Charité—Universitätsmedizin Berlin, Berlin, Germany
2. Deutsche Gesellschaft für Allgemein- und Viszeralchirurgie E. V., Berlin, Germany
3. Comprehensive Cancer Centre Mainfranken, University of Würzburg, Würzburg, Germany
4. Department of General, Visceral, Transplant, Vascular and Paediatric Surgery, University of Würzburg, Würzburg, Germany