1 Department of Visceral Surgery and Medicine, Bern University Hospital and University of Bern, Switzerland, 3010, Bern, Switzerland. dino.kroell@insel.ch.
2 Department of Surgery, FMI Hospital Interlaken, Switzerland, 3800, Interlaken, Switzerland. arnold.kohler@spitalfmi.ch.
3 Department of Visceral Surgery and Medicine, Bern University Hospital and University of Bern, Switzerland, 3010, Bern, Switzerland. philipp.nett@insel.ch.