1. Department of Physical Therapy, Faculty of Health and Welfare, Prefectural University of Hiroshima, 1-1 Gakuen-cho, Mihara-shi, Hiroshima 723-0053, Japan
2. Department of Physical Therapy, Faculty of Health Sciences, Okayama Healthcare Professional Uni- versity, 3-2-18 Daiku, Kita-ku, Okayama-shi, Okayama 700-0913, Japan