aRehabilitation Center, KKR Takamatsu Hospital, Takamatsu

bDepartment of Physical Therapy, School of Rehabilitation, Hyogo Medical University, Kobe

cDepartment of Rehabilitation Medicine, Tokyo Women's Medical University Hospital, Tokyo

dNational Center for Geriatrics and Gerontology, Obu, Japan

Correspondence to Hidetaka Wakabayashi, MD, PhD, Department of Rehabilitation Medicine, Tokyo Women's Medical University Hospital, 8-1, Kawada-cho, Shinjuku-ku, Tokyo 162-0054, Japan. Tel: +81 3 3353 8111; fax: +81 3 5269 7639; e-mail: [email protected]