Affiliation: | 1. Department of Obstetrics and Gynecology, Iwate Medical University School of Medicine, 19-1 Uchimaru, Morioka, 020-8505, Japan 2. Department of Obstetrics and Gynecology, National Hospital Organization Kokura Medical Center, Kokura, Japan 3. Department of Gynecology, Miyama Hospital, Oshu, Japan 4. Department of Gynecology, Medical Coat Hachinohe West Hospital, Hachinohe, Japan
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