1. Department of Reproductive Health and Midwifery, School of Nursing and Midwifery, Tehran University of Medical Sciences, Tehran, Iran
2. Department of Midwifery, Health Reproductive Research Center, Sari Branch, Islamic Azad University, Sari, Iran
3. Department of Biostatistics, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran
4. Tufts School of Medicine, Department of Public Health and Community Medicine, Boston, MA, USA
5. Sexual and Reproductive Health Research Center, Mazandaran University of Medical Sciences, Sari, Iran