TOKUNAKA Mayumi, MATSUOKA Ryu, GOTO Minako, TAKITA Hiroko, ARAKAKI Tatsuya, HAMADA Syoko, OBA Tomohiro, KOIDE Keiko, ISHIKAWA Tatsuya, SEKIZAWA Akihiko (Obstetrics and Gynecology, Showa University School of Medicine)

POOH Ritsuko, MACHIDA Megumi, NAKAMURA Takako (CRIFM Clinical Research Institute of Fetal Medicine PMC)

YAMAMOTO Yuka¹, TAKAHASHI Ken², YOSHIDA Koyo¹ (1.OB & GYN, Juntendo University Urayasu Hospital, 2.Pediatrics, Juntendo University Faculty of Medicine)

OYAMA Rie, ISURUGI Chizuko, KAWAMURA Hanae, SASAKI Yuri, KANASUGI Tomonobu, KIKUCHI Akihiko, BABA Tsukasa (Obstetrics and Gynecology, Iwate Medical University)

KANAGAWA Takeshi (Department of Maternal-Fetal Medicine, Osaka Women‘s and Children’s Hospital)