1. Department of Medical OncologyUniversity Hospital of Besançon Besançon France
2. Methodology and Quality of Life in Oncology UnitUniversity Hospital of Besançon Besançon France
3. Lille University HospitalDepartment of Digestive Surgery Lille France
4. FREGAT (French Esophageal and Gastric Tumour) working group Paris France
5. Department of Digestive Surgery and Liver TransplantationUniversity Hospital of Besançon Besançon France
6. Department of SurgeryNord Franche Comté Hospital Montbeliard France
7. Department of SurgeryNord Franche Comté Hospital Belfort France
8. Department of Oncology and RadiotherapyNord Franche Comté Hospital Montbeliard France
9. Department of GastroenterologyHospital of Vesoul Vesoul France
10. University of Franche‐Comté Besançon EA 3181 France
11. Unit 1098INSERMUniversity of Franche‐Comté Besançon France
12. Clinical Investigational CenterUniversity Hospital of Besançon CIC‐1431 France