1. Department of Digestive Surgery, University Hospital of Caen, Caen Cedex, France.
2. UMR INSERM 1086 UCN ‘ANTICIPE,’ Caen, France.
3. Registre des Tumeurs Digestives du Calvados, Caen, France.
4. Department of Research, University Hospital of Caen, Caen Cedex, France.