1. Infectious Diseases and Tropical Medicine Research Center Shahid Beheshti University of Medical Sciences Tehran Iran
2. Infectious Diseases Research Center AJA University of Medical Sciences Tehran Iran
3. Department of Infectious Diseases Faculty of Medicine AJA University of Medical Sciences Tehran Iran
4. Department of Adult Gastroenterology and Hepatology Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences Tehran Iran