1. Department of Family Medicine, National Taiwan University Hospital Jin-Shan Branch, New Taipei City, Taiwan.
2. School of Nursing, College of Medicine and Hospital, National Taiwan University, Taipei, Taiwan.
3. Department of Family Medicine, College of Medicine and Hospital, National Taiwan University, Taipei, Taiwan.
4. Division of Gerontology Research, National Health Research Institutes, Zhunan, Miaoli County, Taiwan.