Shinnosuke IWAI, Katusuke OZAWA, Takaya NAGAKUBO, Taisuke MORITA, Noriko KUROSAKA, Saho FUJINO, Jin MUROMOTO, Rika SUGIBAYASHI, Seiji WADA, Haruhiko SAGO (Center for Maternal-Fetal, Neonatal and Reproductive Medicine, National Center for Child Health and Development)

Motoyoshi KAWATAKI (Depat. of Neonatology, Kanagawa Children’s Medical Center)

Naoya AKIBA, Takahiro SEYAMA, Taiki SAMEJIMA, Mari ICHINOSE, Masatake TOSHIMITSU, Keiichi KUMASAWA, Takayuki IRIYAMA, Yutaka OOSUGA (Obstetrics and Gynecology, The University of Tokyo)

Akiko NAGASAWA¹, Akiko OMOTO¹, Rie SHINNO¹, Yoshiya SUZUKI¹, Jyun OKAYAMA¹, Kumiko ISHII¹, Satoko ARAI^1,2, Kaori KOUGA¹ (1.Obstetrics and Gynecology, Chiba University Hospital, 2.Test department, Chiba University Hospital)

Rei SUNAMI, Satoshi SHINOHARA, Tatsuya YOSHIHARA, Kana MOCHIZUKI, Genki YASUDA, Mayuko KASAI (Obstetrics, Yamanashi Prefectural Central Hospital)