1 Division of Geriatrics and Gerontology, Institute of Population Health Sciences, National Health Research Institutes, Taiwan.
2 Division of Geriatrics and Gerontology, Institute of Population Health Sciences, National Health Research Institutes, Taiwan; Department of Family Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.
3 Division of Geriatrics and Gerontology, Institute of Population Health Sciences, National Health Research Institutes, Taiwan; Department of Family Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan. Electronic address: chency@nhri.org.tw.