1. Urology and Transplantation Department, University Hospital of Caen, 14000 Caen, France
2. Department of Digestive Surgery, University Hospital of Caen, 14000 Caen, France
3. Registre des Tumeurs Digestives, INSERM UMR 1086 ANTICIPE, 14032 Caen, France
4. Department of Biostatistics, University Hospital of Caen, 14000 Caen, France
5. Pôle de Formation et de Recherche en Santé, 2 rue des Rochambelles, 14033 Caen, France