Riko TAKAYOSHI^1,2, Toshiyuki HATA^1,2, Yasunari MIYAGI³, Takahito MIYAKE^1,2,3, Kenji KANENISHI² (1.Obstetrics and Gynecology, Miyake Clinic, 2.Perinatology and Gynecology, Kagawa University Graduate School of Medicine, 3.Gynecology, Miyake Ofuku Clinic)

Shintaro SHO, Yoshifumi KASUGA, Junko TAMAI, Asuka HAMURO, Yuka FUKUMA, Yuya TANAKA, Toshimitsu OTANI, Satoru IKENOUE, Yuki OHASHI, Mamoru TANAKA (Obstetrics and Gynecology, Keio University School of Medicine)

Takashi KAJI¹, Toshiyuki YASUI², Natsumi YAMAGUCHI³, Aya SHIRAKAWA¹, Ayuka MINEDA¹, Atsuko YOSHIDA¹, Takeshi IWASA¹ (1.Department of Obstetrics and Gynecology, Tokushima University Hospital, 2.Department of Reproductive and Menopausal Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School, 3.Department of Ultrasonography, Tokushima University Hospital)

Yuka YAMASHITA, Ryu MATSUOKA, Tatsuya ARAKAKI, Sayumi NAKAO, Takeshi NAKAMURA, Aiko SEKINE, Hiroko TAKITA, Mayumi TOKUNAKA, Akihiko SEKIZAWA (Department of Obstetrics and Gynecology, Showa University School of Medicine)

Ayumi OKUYAMA, Kohei SEO, Yusuke SUZUKI, Ruiko MIURA, Takashi SHIMOKAWA, Tatsuya IZDEBSKI, Minako GOTO, Kiyotake ICHIZUKA (Obstetrics and Gynecology, Showa University Northern Yokohama Hospital)