1. Division of Clinical Epidemiology and Aging Research German Cancer Research Center (DKFZ) Heidelberg Germany
2. Medical Faculty Heidelberg Heidelberg University Heidelberg Germany
3. German Cancer Consortium (DKTK) German Cancer Research Center (DKFZ) Heidelberg Germany
4. Division of Preventive Oncology German Cancer Research Center (DKFZ) and National Center for Tumor Diseases (NCT) Heidelberg Germany
5. Department of Research Netherlands Comprehensive Cancer Organization (IKNL) Utrecht The Netherlands
6. Department of Surgery Radboud University Medical Centre Nijmegen The Netherlands
7. Department of Surgery University Medical Center Utrecht Utrecht The Netherlands
8. Belgian Cancer Registry (BCR) Brussels Belgium
9. Department of Esophageal and Gastric Surgery Lund University Hospital Lund Sweden
10. Department of Clinical Science, Intervention, and Technology (CLINTEC), Division of Surgery Karolinska University Hospital Stockholm Sweden
11. Registry Department The Cancer Registry of Norway (CRN) Oslo Norway
12. Epidemiology and Cancer Registry Institute of Oncology Ljubljana Ljubljana Slovenia
13. Estonian Cancer Registry National Institute for Health Development Tallinn Estonia
14. Department of Surgical Oncology Leiden University Medical Center Leiden The Netherlands
15. Department of Surgery Erasmus MC‐University Medical Centre Rotterdam Rotterdam The Netherlands