Affiliation: | 1. Department of Obstetrics and Gynecology, Tohoku University Graduate School of Medicine, Sendai, Japan 2. Department of Clinical Research Network, Clinical Research, Innovation and Education Center, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan 3. Department of Obstetrics and Gynecology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan 4. Department of Obstetrics and Gynecology, Yamagata University Faculty of Medicine, Yamagata, Japan 5. Department of Obstetrics and Gynecology, Fukushima Medical University, Fukushima, Japan 6. Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan 7. Department of Obstetrics and Gynecology, Iwate Medical University, Morioka, Japan
|