1 Department of General Surgery, Digestive Surgery and Liver and Intestinal Transplantation, Hospices Civils de Lyon, Claude-Bernard Lyon 1 University. University Hospital la Croix-Rousse, 69317 Lyon cedex 04, France. Electronic address: mathieu.bonal@chu-lyon.fr.
2 Department of General Surgery, Digestive Surgery and Liver and Intestinal Transplantation, Hospices Civils de Lyon, Claude-Bernard Lyon 1 University. University Hospital la Croix-Rousse, 69317 Lyon cedex 04, France.