1. Department of Internal Medicine, National Medical Center, Seoul, Korea
2. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea
4. Department of Internal Medicine, Korea University Ansan-Hospital, Korea University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Seoul National University Bundang Hopsital, Seongnam, Korea
6. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
7. Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea
8. Department of Internal Medicine, Uijeongbu St. Mary’s Hospital, The Catholic University of Korea, Uijeongbu, Korea
9. Department of Internal Medicine, Inje University Ilsan-Paik Hospital, Goyang, Korea
10. Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea
11. Department of Internal Medicine, Gachon University Gil Medical Center, Gachon University of Medicine and Science, Incheon, Korea
12. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea
13. Kidney Research Institute, Seoul National University, Seoul, Korea