Michel Suter1,2,3. 1. Department of Surgery, Riviera-Chablais Hospital, 1847, Rennaz, Switzerland. michelsuter@netplus.ch. 2. Department of Visceral Surgery, University Hospital (CHUV), Lausanne, Switzerland. michelsuter@netplus.ch. 3. Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland. michelsuter@netplus.ch.