National Cerebral and Cardiovascular Centre, Kurume University - Department of Pediatrics and Child Health, National Cerebral and Cardiovascular Centre - Office of Biostatistics and Data Management, Osaka Women's and Children's Hospital, Nagano Children’s Hospital, Tohoku University - Graduate School of Medicine, University of Tsukuba, Toho University, Saitama University - Saitama Medical University, Shizuoka Children’s Hospital, Kanagawa Children’s Medical Center, National Center for Child Health and Development, Nippon Medical School, National Cerebral and Cardiovascular Centre, National Cerebral and Cardiovascular Centre, National Cerebral and Cardiovascular Centre, National Cerebral and Cardiovascular Centre, National Cerebral and Cardiovascular Centre - Center for Advancing Clinical and Translational Sciences, National Center for Child Health and Development, Mie University - Department of Obstetrics and Gynecology and affiliation not provided to SSRN