1. Reproductive Epidemiology Research Centre Royan Institute for Reproductive Biomedicine ACECR Tehran Iran
2. Pregnancy Health Research Centre Department of Obstetrics and Gynaecology School of Medicine Zahedan University of Medical Sciences Zahedan Iran
3. Department of Obstetrics and Gynaecology Imam Khomeini Hospital Tehran University of Medical Sciences Tehran Iran
4. Research Development Centre Arash Women’s Hospital Tehran University of Medical Sciences Tehran Iran
5. School of Nursing and Midwifery Guilan University of Medical Sciences Rasht Iran
6. Department of Biostatistics and Epidemiology School of Public Health Babol University of Medical Sciences Babol Iran
7. Infertility and Reproductive Health Research Center Health Research Institute Babol University of Medical Sciences Babol Iran