^○Chihiro Ishizawa, Shun Akaeda, Reina Ito, Machiko Kojima, Chinami Makii, Koichi Hashimoto, Koicih Kobayashi (Department of Obstetrics and Gynecology, Tokyo Yamate Medical center, Japan)

^○Yasuhiko Shiki, Shota Higame, Tomomi Deguchi, Yusuki Tanaka (Osaka Rosai Hospital, Japan)

^○Yasuhiko Shiki, Shota Higami, Tomomi Deguchi, Yusuke Tanaka (Osaka Rosai Hospital, Japan)

^○Keisuke Murakami, Mari Kitade, Shiori Takeuchi, Eri Kitamura, Asako Ochiai, Yu Kawasaki, Shinichiro Ikuma, Yukiko Okada, Atsuo Itakura (Department of Obstetrics and Gynecology, Juntendo University Faculty of Medicine, Tokyo, Japan)

^○Shiho Oide¹, Masayo Yamada¹, Motohiro Nishio¹, Sekikawa Tomoshige², Kyouko Yamamoto¹, Yasuki Koyasu¹ (1.Department of Gynecology, Women's Center, Yotsuya Medical Cube, Tokyo, Japan, 2.Minimally invasive surgery center, Yotsuya Medical Cube, Tokyo, Japan)

^○Reina Sonehara, Tomoko Nakamura, Natsuki Nakanishi, Yoshiki Ikeda, Satoko Oosuka, Maki Goto, Hiroaki Kajiyama, Hideaki Tanaka, Natsuki Miyake, Mayuko Murakami (Department of Obstetrics and Gynecology, University, Nagoya, Japan)

^○Shota Higami, Kotaro Shimura, Mariko Jitsumori, Tomomi Deguchi, Mariko Shiraishi, Yusuke Tanaka, Yasuhiko Shiki (Department of Obstetrics and Gynecology, Osaka Rosai Hospital, Sakai, Osaka, Japan)

^○Yasunori Yoshino, Kiyoshi Kanno, Michiru Yasui, Kei Katou, Kyoko Shimada, Mari Sawada, Shintaro Sakate, Shirori Yanai, Tomonori Hada, Masaaki Andou (Department of Obstetrics and Gynecology, Kurashiki Medical Center, Okayama, Japan)

^○Eri Katayama¹, Yuko Okajima¹, Kaori Kuroda¹, Yuei Tetsubayashi¹, Miki Takehara¹, Misaki Ogawa¹, Nobuhisa Honda² (1.Department of Obstetrics and Gynecology, National Hospital Organization Chiba Medical Center, Chiba, Japan, 2.Department of Obstetrics and Gynecology, Tokyo Bay Urayasu Ichikawa Medical Center, Chiba, Japan)

^○Masahiro Misawa, Ken Imai, Azusa Shibata, Naoki Ichii, Kenro Chikazawa, Tomoyuki Kuwata, Ryo Konno (Department of Obstetrics and Gynecology, Jichi Medical University Saitama Medical Center, Japan)

^○Masafumi Segawa, Aya Fujioka, Kenichi Nakamura, Emi Yonemori, Nami Tamura, Takayuki Kawai, Hanae Sekine, Mari Maehara, Tomohito Ishiguro, Tomoko Itoga, Shin Suga, Nobuko Nishioka (Department of Obstetrics and Gynecology, Koshigaya Municipal Hospital, Saitama, Japan)

^○Tomohito Ishiguro, Nobuko Nishioka, Emi Yonemori, Masahiro Segawa, Nami Tamura, Takayuki Kawai, Aya Fujioka, Maiko Yamaguchi, Hanae Sekine, Mari Maebara, Kenichi Nakamura, Shin Suga (Department of Obstetrics and Gynecology, Koshigaya Municipal Hospital, Saitama, Japan)

^○Kohjiro Tanabe¹, Takanori Watanabe², Hitoshi Niikura¹ (1.Department of Obstetrics and Gynecology, Sendai Medical Center, Miyagi, Japan, 2.Watanabe Obstetrics and Gynecology Internal Medicine Pediatric Clinic, Japan)

^○Kentaro Nakaoka, Kuniaki Ota, Takafumi Mukai, Masafumi Katakura, Toshimitsu Maemura, Yukiko Katagiri, Mineto Morita (Obstetrics and Gynecology, Toho University Omori Medical Center, Japan)