1. Golestan Research Center of Gastroenterology and Hepatology, Golestan University of Medical Sciences, Gorgan, Iran
2. Clinical Research Development Unit (CRDU), Golestan University of Medical Sciences, Gorgan, Iran
3. Deputy of Public Health, Golestan University of Medical Sciences, Gorgan, Iran
4. Deputy of Pathology, Golestan University of Medical Sciences, Gorgan, Iran
5. Cancer Research Center, Golestan University of Medical Sciences, Gorgan, Iran