1. Isere Cancer Registry University Hospital of Grenoble Grenoble France
2. French Network of Cancer Registries (FRANCIM) Toulouse France
3. Tarn Cancer Registry Claudius Regaud Institute Toulouse France
4. Digestive Cancer Registry of Burgundy Dijon University Hospital Dijon France
5. Unit 1231 Epidemiology and Clinical Research in Digestive Cancers, National Institute of Health and Medical Research University of Burgundy‐Franche Comte Dijon France