1. Student Research Committee, Ilam University of Medical Sciences, P.O. Box 69311-57793, Ilam, Iran
2. Department of Clinical Epidemiology, Faculty of Medicine, Ilam University of Medical Sciences, P.O. Box 69315-138, Ilam, Iran
3. Prevention of Psychosocial Injuries Research Centre, P.O. Box 69311-57793, Ilam, Iran
4. Department of Epidemiology, School of Health & Nutrition, Shiraz University of Medical Sciences, P.O. Box 71348-14366, Shiraz, Iran