1. Division of Family Medicine, National Yang-Ming University Hospital, Yilan, Taiwan.
2. Faculty of Medicine, School of Medicine, National Yang-Ming University, Taipei, Taiwan.
3. Department of Nephrology, Taipei Veterans Hospital, Taipei, Taiwan.
4. Department of Family Medicine, Taipei Veterans Hospital, Taipei, Taiwan.
5. Department of Medical Teaching and Research, National Yang-Ming University Hospital, Yilan, Taiwan.