Antoine Ailhaud1, Bertrand Trilling1,2, Jean-Luc Faucheron3,4. 1. Colorectal Unit, Ambulatory Unit, Department of Surgery, Michallon University Hospital, CS 10 217, 38000, Grenoble Cedex, France. 2. University Grenoble Alps, UMR 5525, CNRS, TIMC-IMAG, 38000, Grenoble, France. 3. Colorectal Unit, Ambulatory Unit, Department of Surgery, Michallon University Hospital, CS 10 217, 38000, Grenoble Cedex, France. JLFaucheron@chu-grenoble.fr. 4. University Grenoble Alps, UMR 5525, CNRS, TIMC-IMAG, 38000, Grenoble, France. JLFaucheron@chu-grenoble.fr.