Meng Qin^1,2, Junzo Hamanishi², Masayo Ukita², Shiro Takamatsu², Taito Miyamoto², Yuka Mise^1,2, Akihiko Ueda², Yoko Furutake², Xiang Zeng², Koji Yamanoi², Kaoru Abiko³, Ken Yamaguchi², Lingya Pan¹, Masaki Mandai² (1.Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China, 2.The Department of Gynecology and Obstetrics, Kyoto University Graduate School of Medicine, Kyoto, Japan, 3.Shiga general hospital National hospital organization Kyoto medical center)

Masayo Ukita¹, Junzo Hamanishi¹, Koji Yamanoi¹, Kaoru Abiko², Ken Yamaguchi¹, Tsukasa Baba³, Noriomi Matsumura⁴, Masaki Mandai¹ (1.Department of Gynecology and Obstetrics, Kyoto University Graduate School of Medicine, Kyoto, Japan, 2.Department of Obstetrics and gynecology, Kyoto Medical Center, 3.Department of Obstetrics and gynecology, Iwate Medical University, 4.Department of Obstetrics and gynecology, Kinki University Faculty of Medicine)

Mayuko Miyamoto, Kenjiro Sawada, Masaki Kobayashi, Aasa Shimizu, Misa Yamamoto, Taro Yagi, Tadashi Kimura (Obstetrics and gynecology, Osaka University, Osaka, Japan)

Masaki Kobayashi, Kenjiro Sawada, Mayuko Miyamoto, Aasa Shimizu, Misa Yamamoto, Mahiru Kawano, Michiko Kodama, Kae Hashimoto, Tadashi Kimura (Department of Obstetrics and Gynecology, Osaka University)