1 Burgundy Digestive Cancer Registry, INSERM, LNC-UMR1231, University Bourgogne Franche-Comté, Dijon, France; University hospital Dijon, University Bourgogne Franche-Comté, Dijon, France.
2 Burgundy Digestive Cancer Registry, INSERM, LNC-UMR1231, University Bourgogne Franche-Comté, Dijon, France; University hospital Dijon, University Bourgogne Franche-Comté, Dijon, France. Electronic address: come.lepage@u-bourgogne.fr.
3 Burgundy Digestive Cancer Registry, INSERM, LNC-UMR1231, University Bourgogne Franche-Comté, Dijon, France.