Kiwako Yamamoto-Hanada, Kyongsun Pak, Shintaro Iwamoto, Mizuho Konishi, Mayako Saito-Abe, Miori Sato, Yumiko Miyaji, Hidetoshi Mezawa, Minaho Nishizato, Limin Yang, Natsuhiko Kumasaka, Yukihiro Ohya, for the Japan Environment and Children's Study (JECS) Group.