1. Aging and Health Research Center; National Yang-Ming University; Taipei Taiwan
2. Institute of Public Health; National Yang-Ming University; Taipei Taiwan
3. Center for Geriatrics and Gerontology; Taipei Veterans General Hospital; Taipei Taiwan
4. Banciao Veterans Home; Banciao, New Taipei City Taiwan
5. Center for Geriatrics and Gerontology; Kaohsiung Veterans General Hospital; Kaohsiung Taiwan
6. Department of Healthcare and Medical Care; Veterans Affairs Council; Taipei Taiwan