1. Gastrointestinal and Liver Disease Research Center (GILDRC), Firoozgar Hospital, Iran University of Medical Sciences, Tehran, Iran
2. Epidemiology & Biostatistics Department, School of Public Health, Neyshabur University of Medical, Sciences, Neyshabur, Iran
3. Department of Public Health, Neyshabur University of Medical Sciences, Neyshabur, Iran
4. Student Research Committee, Neyshabur University of Medical Sciences, Neyshabur, Iran
5. Noncommunicable Diseases Research Centre, Neyshabur University of Medical Sciences, Neyshabur, Iran