1. Faculty of Health Science, Mejiro University: 320 Ukiya, Saitama-shi, Saitama 339-850, Japan
2. Graduate School of Health and Social Services, Saitama Prefectural University, Japan
3. Faculty of Health Science, Ryotokuji University, Japan
4. Department of Physical Medicine and Rehabilitation, Geriatric Health Services Facility, Caretown Yuyu, Medical Corporation Meikeikai, Japan
5. Department of Rehabilitation Medicine, Tokyo Medical and Dental University Graduate School, Japan
6. Department of Orthopaedic Surgery, Dokkyo Medical University Saitama Medical Center, Japan