1. Department of Reproductive Health and Midwifery, Faculty of Medical Sciences Tarbiat Modares University Tehran Iran
2. Department of Biostatistics, Faculty of Medical Sciences Tarbiat Modares University Tehran Iran
3. Counseling in Midwifery, Research Committee School of Nursing and Midwifery Nasibeh Sari Iran
4. Department of Public Health and Community Medicine Tufts University School of Medicine Boston Massachusetts USA