1. Department of Physical Medicine and Rehabilitation, Geriatric Health Services Facility, Caretown Yuyu, Medical Corporation Meikeikai, Saitama, Japan
2. Department of Rehabilitation Medicine, Tokyo Medical and Dental University Graduate School, Tokyo, Japan
3. Graduate School of Health and Social Services, Saitama Prefectural University, Saitama, Japan
4. Department of Orthopaedic Surgery, Dokkyo Medical University Saitama Medical Center, Saitama, Japan