1. Department of Midwifery, Khalkhal University of Medical Sciences, Khalkhal, Iran
2. Student Research Committee, Khalkhal University of Medical Sciences, Khalkhal, Iran
3. Department of Statistics and Epidemiology, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, Iran
4. Department of Public Health, Khalkhal University of Medical Sciences, Khalkhal, Iran