Karem Slim1, Marie Selvy2, Alexandre Theissen3. 1. Department of Digestive Surgery, University Hospital, CHU Clermont-Ferrand, Place Lucie Aubrac, 63003 Clermont-Ferrand, France; Francophone Group for Enhanced Recovery After Surgery (GRACE), 63110 Beaumont, France. Electronic address: kslim@chu-clermontferrand.fr. 2. Department of Digestive Surgery, University Hospital, CHU Clermont-Ferrand, Place Lucie Aubrac, 63003 Clermont-Ferrand, France; Francophone Group for Enhanced Recovery After Surgery (GRACE), 63110 Beaumont, France. 3. Department of Anaesthesia, Princess Grace Hospital, Avenue Pasteur, Monaco.