Affiliation: | 1. Department of General Surgery, General Hospital Zell am See, Zell am See, Austria;2. Department of General and Visceral Surgery, Sisters of Charity Hospital, Linz, Austria;3. Division of Gastrointestinal and Minimally Invasive Surgery, Oregon Clinic, Portland, Oregon, USA;1. Division of Gastroenterology, University of Florida, Gainesville, Florida, USA;2. Indiana University Medical Center, Indianapolis, Indiana, USA |