1. Department of Rehabilitation Medicine The University of Tokyo Hospital Bunkyo‐kuJapan
2. Department of Rehabilitation Medicine Shizuoka Children’s Hospital Shizuoka Japan
3. Department of Orthopedics Tokyo Metropolitan Kita Medical Rehabilitation Center for the Disabled Kita‐kuJapan
4. Department of Orthopedics National Rehabilitation Center for Children with Disabilities Itabashi‐kuJapan
5. Department of Pediatric Orthopedics Shizuoka Children's Hospital Shizuoka Japan