1. Colorectal Research Center, Iran University of Medical Sciences, Tehran, Iran
2. Gastrointestinal and Liver Diseases Research Center, Iran University of Medical Sciences, Tehran, Iran
3. Clinical Research Development Center, Qom University of Medical Sciences, Qom, Islamic Republic of Iran
4. Associate Professor, Gastroenterology and Hepatology Disease Research Center, Qom University of Medical Sciences, Qom, Islamic Republic of Iran