Affiliation: | 1. Center for Minimally Invasive Surgery, Neuwerk Hospital, M?nchengladbach, Germany 2. Department of General Surgery, University Hospital of Heraklion, University of Crete, Athinon-Souniou 11, Keratea, 19001, Athens, Greece 3. Department of General and Visceral Surgery, Hospital Zell am See, Zell am See, Austria
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