1. Department of Emergency Medicine, Chi-Mei Medical Center, Tainan, Taiwan
2. Department of Geriatrics and Gerontology, ChiMei Medical Center, Tainan, Taiwan
3. Department of Medical Research, Chi-Mei Medical Center, Tainan, Taiwan
4. Department of Physical Medicine and Rehabilitation, Chiali Chi-Mei Hospital, Tainan 710, Taiwan
5. Department of Physical Medicine and Rehabilitation, Chung San Medical University Hospital, Taichung, Taiwan.