1. Department of Emergency Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
2. Gastroenterology and Liver Diseases Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3. School of Medical Education and Management, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4. Student Research Committee, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
5. USERN Office, Shahid Beheshti University of Medical Sciences, Tehran, Iran