1. Golestan Research Center of Gastroenterology and Hepatology Golestan University of Medical Sciences Gorgan Iran
2. Cancer Research Center Golestan University of Medical Sciences Gorgan Iran
3. Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics National Cancer Institute Bethesda Maryland USA
4. Deputy of Public Health Golestan University of Medical Sciences Gorgan Iran
5. Deputy of Treatment Golestan University of Medical Sciences Gorgan Iran
6. Department of Pathology Golestan University of Medical Sciences Gorgan Iran
7. Office of the Director International Agency for Research on Cancer (IARC) Lyon France
8. Cancer Surveillance Branch International Agency for Research on Cancer (IARC), World Health Organization (WHO) Lyon France
9. Digestive Oncology Research Center, Digestive Diseases Research Center Tehran University of Medical Sciences Tehran Iran