1 Centre Medico-Chirurgical du Haut-Leveque, Service de Chirurgie Digestive, Avenue de Magellan, 33604 Pessac, France. Electronic address: denis.collet@chu-bordeaux.fr.
2 Centre Medico-Chirurgical du Haut-Leveque, Service de Chirurgie Digestive, Avenue de Magellan, 33604 Pessac, France.