1. Department of Medical Virology, Faculty of Medical Sciences Tarbiat Modares University Tehran Iran
2. Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases Shahid Beheshti University of Medical Sciences Tehran Iran
3. Research Center for Gastroenterology and Liver Diseases, Research Institute for Gastroenterology and Liver Diseases Shahid Beheshti University of Medical Siences Tehran Iran