1 Center for Postgraduate Education and Training, National Center for Child Health and Development, Tokyo, Japan.
2 Division of Neurology, National Center for Child Health and Development, 2-10-1, Okura, Setagaya-ku, Tokyo, 157-8535, Japan. itaruhayakawa@gmail.com.
3 Department of General Pediatrics and Interdisciplinary Medicine, National Center for Child Health and Development, Tokyo, Japan.