B Trilling1,2, J-L Faucheron3,4. 1. Colorectal Unit, Department of Surgery, Michallon University Hospital, 38000, Grenoble, France. 2. UMR 5525, TIMC-IMAG, University Grenoble Alpes, CNRS, 38000, Grenoble, France. 3. Colorectal Unit, Department of Surgery, Michallon University Hospital, 38000, Grenoble, France. JLFaucheron@chu-grenoble.fr. 4. UMR 5525, TIMC-IMAG, University Grenoble Alpes, CNRS, 38000, Grenoble, France. JLFaucheron@chu-grenoble.fr.