1Department of Visceral, Vascular and Thoracic Surgery, Cantonal Hospital Olten (soH), Baslerstraße 150, 4600 Olten, Switzerland
2Department of General, Visceral and Vascular Surgery, Cantonal Hospital Baden, Im Engel 1, 5404 Baden, Switzerland
3Department of Surgery, AZ Maria Middelares, Buitenring Sint-Denijs 30, 9000 Ghent, Belgium
4Department of General, Visceral, Transplant, Vascular and Pediatric Surgery, University Hospital Wuerzburg, Oberduerrbacher Str. 6, 97080 Wuerzburg, Germany
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