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
3Hernienzentrum Zurich, Grossmuensterplatz 9, 8001 Zurich, Switzerland
4Department of General, Visceral, Transplant, Vascular and Pediatric Surgery, University Hospital Wuerzburg, Oberduerrbacher Straße 6, 97080 Wuerzburg, Germany
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