Susumu MURATA¹, Norie NAO², Maki OKADA¹, Yuichiro SHIRAFUTA¹, Keiko MATSUMOTO², Masami MATSUURA², Ryo MAEKAWA¹, Norihiro SUGINO¹ (1.Obstetrics and Gynecology, Yamaguchi University Hospital, 2.Nursing Faculty, Yamaguchi University Hospital)

Mayumi TAKANO, Mayu TACHIHARA, Sena SHIMIZU, Hikari KOTAKI, Makiko SHIMABUKURO, Sumito NAGASAKI, Masahiko NAKATA (Obstetrics and Gynecology, Toho University Faculty of Medicine)

Kana SUGETA, Shusaku HAYASHI, Takuma YAMADA, Maiko WAGATA, Ryo YAMAMOTO, Keisuke ISHII (Maternal Fetal Medicine, Osaka Women’s and Children’s Hospital)

Saki TAMURA, Shunsuke TAMARU, Natsuko TAKANO, Tetsu YAMAGUCHI, Eriko HIRABAYASHI, Tsuguhiro HORIKOSHI, Yoshimasa KAMEI (Department of Obstetrics and Gynecology, Saitama Medical University)

Chikara KIHIRA, Eiji RYO, Keita YATSUKI, Miki NISHIZAWA, Ippei NAKAGAWA, Hideo KAMATA, Haruko HIRAIKE, Koichirou KIDO, Yukifumi SASAMORI, Kazunori NAGASAKA (Obstetrics, Teikyo Univ)