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. National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, Iran;
3. Department of Biology, Babol Branch Islamic Azad University, Babol, Iran;
4. Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran