1. Department of General, Visceral and Transplant Surgery, University Hospital RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Germany
2. Department of Surgery, Maastricht University, Maastricht, The Netherlands
3. Surgical Working Group of “Young Surgeons” (CAJC) of the German Society for General and Visceral Surgery (DGAV), Berlin, Germany,