1. Digestive Oncology Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran, Iran
2. Section of Genetics, International Agency for Research on Cancer, World Health Organization, Lyon, France
3. Liver and Pancreatobiliary Diseases Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran, Iran
4. Digestive Disease Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran, Iran
5. Golestan Research Center of Gastroenterology and Hepatology, Golestan University of Medical Sciences, Gorgan, Iran
6. Ischemic Disorders Research Center, Golestan University of Medical Sciences, Gorgan, Iran
7. Cancer Research Center, Golestan University of Medical Sciences, Gorgan, Iran
8. Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, USA
9. Surveillance and Health Services Research, American Cancer Society, Atlanta, Georgia, USA
10. Department of Biology, School of Computer, Mathematical, and Natural Sciences, Morgan State University, Baltimore, Maryland, USA
11. Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
12. Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA