1. Department of Health Promotion, National Institute of Public Health, Saitama, Japan.
2. Department of Neurology, Hyogo Prefectural Kobe Children's Hospital, Hyogo, Japan.
3. Department of Psychosocial Medicine, National Centre of Child Health and Development, Tokyo, Japan.
4. Department of Psychiatry, Saitama Children's Medical Centre, Saitama, Japan.
5. Department of Neurosurgery, Hyogo Prefectural Kobe Children's Hospital, Hyogo, Japan.
6. Department of Paediatrics, Kobe University, Hyogo, Japan.