1. Cancer Research Center, Cancer Institute Tehran University of Medical Sciences Tehran Iran
2. Biostatistics Research Group, Department of Health Science University of Leicester Leicester UK
3. Esfahan Cancer Registry Esfahan University of Medical Sciences Esfahan Iran
4. Shiraz Cancer Registry Shiraz University of Medical Sciences Shiraz Iran
5. Mazandaran Cancer Registry Mazandaran University of Medical Sciences Sari Iran
6. Patient Safety Research Center, Clinical Research Institute Urmia University of Medical Sciences Urmia Iran
7. Kermanshah Cancer Registry Kermanshah University of Medical Sciences Kermanshah Iran
8. Hematology and Oncology Research Center Tabriz University of Medical Sciences Tabriz Iran
9. Liver and Pancreatobiliary Diseases Research Center, Digestive Diseases Research Institute Tehran University of Medical Sciences Tehran Iran
10. Kerman Cancer Registry Kerman University of Medical Sciences Kerman Iran
11. Cancer Registry Section Ahvaz Jundishapur University of Medical Sciences Ahvaz Iran
12. International Agency for Research on Cancer (IARC) World Health Organization Lyon France
13. Cancer Survival Group, Department of Non‐communicable Disease Epidemiology London School of Hygiene & Tropical Medicine London UK
14. Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute National Institutes of Health Bethesda Maryland USA
15. Deputy of Health, Ministry of Health and Medical Education Tehran Iran
16. Department of Epidemiology and Biostatistics Kermanshah University of Medical Sciences Kermanshah Iran
17. Golestan Research Center of Gastroenterology and Hepatology Golestan University of Medical Sciences Gorgan Iran
18. Digestive Oncology Research Center, Digestive Disease Research Institute Tehran University of Medical Sciences Tehran Iran