Affiliation: | 1.Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran ;2.Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Aerabi St., Yemen St., Chamran Highway, Tehran, Iran ;3.Medicine Faculty of Mashhad Branch, Islamic Azad University, Mashhad, Iran ; |