[1
]
Pregnancy Health Research Center, Department of Obstetrics and Gynecology, School
of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran.
[2
]
Research Development Center, Arash Women's Hospital, Tehran University of Medical
Sciences, Tehran, Iran.
[3
]
Department of Biostatistics and Epidemiology, Babol University of Medical Sciences,
Babol, Iran.
[4
]
Department of Obstetrics and Gynecology, School of Medicine, Isfahan University of
Medical sciences, Isfahan, Iran.
[5
]
Department of Epidemiology, School of Health, Arak University of Medical Sciences,
Arak, Iran.
[6
]
Department of Obstetrics and Gynecology, Imam Khomeini Hospital, Tehran University
of Medical Sciences, Tehran, Iran.