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[\'Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.\', \'Department of Obstetrics and Gynecology, Yokohama City University Graduate School of Medicine, Yokohama, Japan.\', \'Department of Public Health, Dokkyo Medical University, School of Medicine, Tochigi, Japan.\', \'Perinatal Center for Maternity and Neonates, Yokohama City University Medical Center, Yokohama, Japan.\', \'Obstetrics and Gynecology, Mie University Graduate School of Medicine, Tsu, Japan.\', \'Department of Obstetrics and Gynecology, Osaka University Graduate School of Medicine, Osaka, Japan.\', \'Department of Obstetrics and Gynecology, Kobe University Graduate School of Medicine, Kobe, Japan.\']
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