1. Guilan University of Medical Sciences (GUMS), Caspian Digestive Diseases Research Center (CDDRC), Rasht, Iran
2. Razi Hospital, Guilan University of Medical Sciences (GUMS), Gastrointestinal and Liver Diseases Research Center (GLDRC), Rasht, Iran
3. Guilan University of Medical Sciences (GUMS), GI Cancer Screening and Prevention Research Center (GCSPRC), Rasht, Iran
4. Guilan University of Medical Sciences (GUMS), Gastrointestinal and Liver Diseases Research Center (GLDRC), Rasht, Iran