1. Gastroenterology and Hepatology Disease Research Center, Qom University of Medical Sciences, Qom, Iran
2. Gastrointestinal and Liver Disease Research Center, Iran University of Medical Sciences, Firoozgar Hospital, Tehran, Iran
3. Department of Epidemiology, Qom
University of Medical Sciences, Qom, Iran
4. Department of Anesthesiology and Critical Care, Qom University of Medical Sciences, Qom, Iran