J-L Faucheron1,2, B Trilling3,4. 1. Colorectal Unit, Department of Surgery, Michallon University Hospital, CS 10217, 38000, Grenoble, France. JLFaucheron@chu-grenoble.fr. 2. UMR 5525, CNRS, TIMC-IMAG, University Grenoble Alpes, 38000, Grenoble, France. JLFaucheron@chu-grenoble.fr. 3. Colorectal Unit, Department of Surgery, Michallon University Hospital, CS 10217, 38000, Grenoble, France. 4. UMR 5525, CNRS, TIMC-IMAG, University Grenoble Alpes, 38000, Grenoble, France.