1. Cancer Research Center, Cancer Institute Tehran University of Medical Sciences Tehran Iran
2. Department of Oncology, Lombardi Comprehensive Cancer Center Georgetown University Washington District of Columbia USA
3. Department of Public Health, School of Public Health Tampere University Tampere Finland
4. International Agency for Research on Cancer (IARC/WHO) Lyon France
5. Biostatistics Research Group, Department of Health Science University of Leicester Leicester UK
6. Department of Biology, School of Computer, Mathematical and Natural Sciences Morgan State University Baltimore Maryland USA
7. Golestan Research Center of Gastroenterology and Hepatology Golestan University of Medical Sciences Gorgan Iran
8. Cancer Research Centre Shahid Beheshti University of Medical Science Tehran Iran
9. Department of Radiation Oncology, Imam Hossein Hospital Shahid Beheshti Medical University Tehran Iran
10. Digestive Diseases Research Center, Digestive Disease Research Institute Tehran University of Medical Sciences Tehran Iran
11. Research Center for Modeling in Health, Institute for Futures Studies in Health Kerman University of Medical Sciences Kerman Iran
12. Department of Epidemiology and Biostatistics Kermanshah University of Medical Sciences Kermanshah Iran
13. International Agency for Research on Cancer (IARC/WHO) Genomic Epidemiology Branch Lyon France
14. Digestive Oncology Research Center, Digestive Disease Research Institute Tehran University of Medical Sciences Tehran Iran
15. Department of Medical and Surgical Sciences University of Bologna Bologna Italy