[1] Klinikum Reg Hannover GmbH, Dept Gen, Krankenhaus Oststadt Heidehaus & Grossburgwedel, D-30659 Hannover, Germany
[2] Klinikum Reg Hannover GmbH, Dept Visceral Surg, Krankenhaus Oststadt Heidehaus & Grossburgwedel, D-30659 Hannover, Germany
[3] Charite, Dept Gen Visceral Thorac & Vasc Surg, D-10117 Berlin, Germany