1. Center for Geriatrics and Gerontology; Taipei Veterans General Hospital; Taipei Taiwan
2. Aging and Health Research Center; National Yang Ming University; Taipei Taiwan
3. Institute of Public Health; National Yang Ming University; Taipei Taiwan
4. Department of Orthopedics; Taipei Veterans General Hospital; Taipei Taiwan
5. Department of Family Medicine; Taipei Veterans General Hospital Yuanshan Branch; Yi-Land Taiwan