1. Department of Rehabilitation, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
2. Department of Orthopedic Surgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
3. Department of Rehabilitation, Spinal Injuries Center, 550-4 Igisu, Fukuoka 820-8508, Japan
4. Department of Rehabilitation, Kansai Rosai Hospital, 3-1-69 Inabasou, Amagasaki City 660-8511, Japan