1. Department of Digestive and Oncologic Surgery; University Hospital of Besancon, Franche-Comté University Besancon; Besancon France
2. Department of Digestive and Hepato-Pancreato-Biliary Surgery; Pitié-Salpêtrière Hospital; Assistance Publique-Hôpitaux de Paris; Paris France
3. Department of Digestive Surgery; Rouen University Hospital; Rouen France
4. Department of Digestive and Oncologic Surgery; Bicêtre Hospital; Assistance Publique-Hôpitaux de Paris; University Institute of Cancerology (Paris VI), Pierre and Marie Curie University; Paris France
5. Department of Colorectal and Oncological Surgery; Purpan Hospital and Toulouse III University; Toulouse France
6. Department of Colorectal Surgery; Beaujon Hospital; Assistance Publique-Hôpitaux de Paris, University Paris VII; Clichy France
7. Department of Surgical Oncology; Institut Paoli-Calmettes; Marseille France
8. Department of Digestive Surgery; Saint-Antoine Hospital; Assistance Publique-Hôpitaux de Paris; Paris France