1. Aging and Health Research Center, National Yang Ming University, Taipei, Taiwan.
2. Department of Geriatric Medicine, National Yang Ming University School of Medicine, Taipei, Taiwan.
3. Center for Geriatrics and Gerontology, Taipei Veterans General Hospital, Taipei, Taiwan.
4. Department of Family Medicine, Taipei City Hospital Hoping Branch, Taipei, Taiwan.
5. Department of Family Medicine, Taipei Veterans General Hospital Yuanshan Branch, Yilan, Taiwan.
6. National Center for Geriatrics and Gerontology, Obu, Japan.
7. Hualien Tzu Chi Hospital, Hualien, Taiwan.