1. Digestive Oncology Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Shariati Hospital, North Kargar Avenue, Tehran 14117-13135, Iran
2. Cardiovascular Research Center, Kermanshah University of Medical Sciences, Imam Ali Hospital, Shahid Beheshti Boulevard, Kermanshah, Iran
3. Liver and Pancreatobiliary Diseases Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Shariati Hospital, North Kargar Avenue, Tehran 14117-13135, Iran
4. Digestive Diseases Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Shariati Hospital, North Kargar Avenue, Tehran 14117-13135, Iran
5. Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
6. Surveillance and Health Services Research, American Cancer Society, Atlanta, GA, USA
7. Golestan Research Center of Gastroenterology and Hepatology, Golestan University of Medical Sciences, Gorgan, Iran
8. Ischemic Disorders Research Center, Golestan University of Medical Sciences, Gorgan, Iran
9. Section of Genetics, International Agency for Research on Cancer, World Health Organization, Lyon, France
10. Department of Population Health, NYU Grossman School of Medicine, New York, NY, USA
11. Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
12. Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom
13. Department of Biology, School of Computer, Mathematical, and Natural Sciences, Morgan State University Portage Avenue Campus, Room 103, Baltimore, MD 21251, USA