1. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Renal Research Institute, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
4. Clinical Research Institute, Seoul National University Hospital, Seoul, Korea.
5. Biotechnology Center, Pohang University of Science and Technology, Pohang, Korea.
6. Department of Internal Medicine, Catholic University Medical College, Seoul, Korea.
7. Department of Internal Medicine, Kyungpook National University, School of Medicine, Daegu, Korea.
8. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea.
9. Department of Medicine, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea.
10. Department of Internal Medicine, Seoul National University College of Medicine, Boramae Medical Center, Seoul, Korea.
11. Department of Internal Medicine, Ulsan University College of Medicine, Asan Medical Center, Seoul, Korea.
12. Department of Internal Medicine and the Institute of Renal Disease, Korea University College of Medicine, Seoul, Korea.