1. Student of Medicine, School of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
2. Gastroenterology Ward, Baharlo Hospital, Tehran University of Medical Sciences, Tehran, Iran
3. Student Research Committee, Hamadan University of Medical Sciences School of Medicine, Hamadan, Iran
4. Clinical Research Development Unit of Shahid Beheshti Hospital, Hamadan University of Medical Science, Hamadan, Iran