1 National Center for Child Health and Development, Setagaya-Ku, Tokyo, Japan. tanaka-kyo@ncchd.go.jp.
2 Division of Adolescent Mental Health, Department of Psychosocial Medicine, National Center for Child Health and Development, 2-10-1 Okura, Setagaya- Ku, Tokyo, 157-8535, Japan. tanaka-kyo@ncchd.go.jp.
3 National Center for Child Health and Development, Setagaya-Ku, Tokyo, Japan.
4 Ochanomizu University Human Developmental Sciences, Bunkyo-Ku, Tokyo, Japan.
5 Department of Pediatrics Juntendo University Faculty of Medicine, Bunkyo-Ku, Tokyo, Japan.
6 Clinic for Children, Akiyama Kodomo Clinic, Mitaka, Tokyo, Japan.