1. Division of Nephrology, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung City, Taiwan
2. Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung City, Taiwan
3. Department of Life Science, Tunghai University, Taichung City, Taiwan
4. School of Medicine, National Yang-Ming University, Taipei, Taiwan.