1. Department of Pediatric Rehabilitation, Hokkaido Medical Center for Child Health and Rehabilitation, Sapporo, Japan
2. Department of Public Health, School of Medicine, Sapporo Medical University, Sapporo, Japan
3. Department of Pediatric Neurology, Bobath Memorial Hospital, Osaka, Japan
4. Department of Pediatric Neurology, Chiba Rehabilitation Center, Chiba, Japan