1. Department of Physical Therapy, Graduate School of Health Sciences; Sapporo Medical University; Sapporo Japan
2. Department of Rehabilitation; Japan Health Care College; Eniwa Japan
3. Department of Preventive Gerontology, Center for Gerontology and Social Science; National Center for Geriatrics and Gerontology; Obu Japan
4. Department of Physical Therapy; Sapporo Medical University School of Health Sciences; Sapporo Japan