1. Department of Hygiene, Epidemiology and Medical Statistics, Medical School National and Kapodistrian University of Athens Athens Greece
2. National Cancer Registry of Ukraine National Cancer Institute & Taras Shevchenko National University of Kyiv Kyiv Ukraine
3. OGYR, Hun Childhood Cancer Registry Semmelweis University Budapest Hungary
4. Belarusian Research Center for Pediatric Oncology, Hematology and Immunology Childhood Cancer Sub‐registry of Belarus Minsk Belarus
5. Bulgarian National Cancer Registry National Oncology Hospital Sofia Bulgaria
6. Central Serbia Cancer Registry Institute of Public Health of Serbia Belgrade Serbia
7. Greater Poland Cancer Registry Greater Poland Cancer Center Poznan Poland
8. Andrija Štampar School of Public Health, School of Medicine University of Zagreb Zagreb Croatia
9. Croatian National Cancer Registry Croatian Institute of Public Health Zagreb Croatia
10. North Region Cancer Registry of Portugal (RORENO) Portuguese Oncology Institute of Porto Porto Portugal
11. Cancer Registry of Slovenia Institute of Oncology Ljubljana Ljubljana Slovenia
12. Izmir Cancer Registry, Izmir Hub Izmir & Hacettepe University Institute of Public Health Ankara Turkey
13. Registo Oncológico Regional do Centro (ROR‐Centro) Instituto Português de Oncologia de Coimbra Francisco Gentil, E.P.E. Coimbra Portugal
14. Health Monitoring Unit Ministry of Health Nicosia Cyprus
15. Department for Policy in Health Information and Research Malta National Cancer Registry Pieta Malta
16. Cluj Regional Cancer Registry The Oncology Institute “Prof. Dr. Ion Chiricuţă” Cluj‐Napoca Romania
17. Regional Cancer Registry National Institute of Public Health Iasi Romania
18. Department of Hygiene and Epidemiology, School of Medicine University of Ioannina Ioannina Greece
19. Center for Evidence Synthesis in Health Brown University School of Public Health Providence RI
20. Clinical Epidemiology Unit, Department of Medicine Karolinska Institute Stockholm Sweden