TAKANO Mayumi^{1, 2}, NAKATA Masahiko^{1, 2}, NAGASAKI Sumito^{1, 2}, SAKUMA Jyunya^{1, 2}, HAYASHI Rika², MORITA Mineto^{1, 2} (1.Obstetrics and Gynecology, Toho University Graduate School of Medicine, 2.Obstetrics and Gynecology, Toho University Omori Medical Center)

OZAWA Katsusuke, HAYASHI Sayaka, ONODERA Yohei, MUROMOTO Jin, SUGIBAYASHI Rika, WADA Seiji, SAGO Haruhiko (Center of Maternal-fetal, Neonatal and Reproductive Medicine, Division of Fetal Medicine, National Center for Child Health and Development)

MIYASHITA Susumu¹, OCHIAI Shouko¹, SAKAMOTO Chiyori¹, MOTEGI Emi¹, TADA Kazumi¹, WATANABE Hiroshi¹, FUKASAWA Ichio² (1.Division of Maternal and Fetal Medicine, Perinatal Medical Center, Dokkyo Medical University, 2.Department of Obstetrics and Gynecology, Dokkyo Medical University)

SEO Kohei¹, DOHI Satoshi¹, ISHIKAWA Tetsuya², OKUYAMA Ayumi¹, OBA Tomohiro², MATSUOKA Ryu², ICHIZUKA Kiyotake¹, OTSUKI Katsufumi³, SEKIZAWA Akihiko², NAGATSUKA Masaaki¹ (1.Obstetrics and Gynecology, Showa University Northern Yokohama Hospital, 2.Obstetrics and Gynecology, Showa University School of Medicine, 3.Obstetrics and Gynecology, Showa University Koto Toyosu Hospital)

FURUYA Natsumi (Department of Obstetrics and Gynecology, St. Marianna University School of Medicine)

HORINOUCHI Takashi, YOSHIZATO Toshiyuki, INOUE Asami, KOUZUMA Yutaka, SHINAGAWA Takaaki, YOKOMINE Masato, USHIJIMA Kimio (Obstetrics and Gynecology, Kurume University Hospital)