1. Arthritis Center, Fukuoka Wajiro Hospital, Fukuoka, Japan
2. Department of Orthopaedic Surgery, Asama General Hospital, Nagano, Japan
3. Department of Rehabilitation, Fukuoka Wajiro Hospital, Fukuoka, Japan
4. Department of Rehabilitation, Asama General Hospital, Nagano, Japan
5. Clinical Research Support Center Kyushu, Fukuoka, Japan