Affiliation: | 1. The Obstetrical Gynecological Society of Osaka, 4-4-3 Kawaramachi, Chuo-ku, Osaka, 541-0048, Japan 2. Department of Obstetrics and Gynecology, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan 3. Department of Obstetrics and Gynecology, Osaka Medical College Graduate School of Medical Sciences, 2-7 Daigakumachi, Takatsuki, Osaka, 569-8686, Japan 4. Department of Obstetrics and Gynecology, Osaka City University Graduate School and Faculty of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka, 545-8585, Japan 5. Department of Obstetrics and Gynecology, Kansai Medical University Graduate School of Medicine, 2-3-1 Shin-machi, Hirakata, Osaka, 573-1191, Japan 6. Department of Obstetrics and Gynecology, Kinki University Graduate School of Medical Sciences, 377-2 Ono- Higashi, Osaka-Sayama, Osaka, 589-8511, Japan 7. Saito Women’s Clinic, 1-6-1 Miyahara, Yodogawa-ku, Osaka, 532-0003, Japan 8. Department of Social and Environmental Medicine, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan 9. Department of Obstetrics and Gynecology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan
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