1. Department of Internal Medicine, Seoul St. Mary's Hospital, The Catholic University, Seoul, Republic of Korea.
2. Department of Internal Medicine, Jeonbuk National University Medical School, Jeonju, Republic of Korea.
3. Department of Internal Medicine & Kidney Research Institute, Hallym University Sacred Heart Hospital, Anyang, Republic of Korea.
4. Division of Nephrology, Department of Internal Medicine, Kyung Hee University, Seoul, Republic of Korea.
5. Department of Internal Medicine, Soonchunhyang University Cheonan Hospital, Cheonan, Republic of Korea.
6. Division of Nephrology, Department of Internal Medicine, Eunpyeong St. Mary's Hospital, The Catholic University, Seoul, Republic of Korea.
7. Department of Internal Medicine & Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea.
8. Department of Internal Medicine, College of Medicine, Institute of Kidney Disease Research, Yonsei University, Seoul, Republic of Korea.
9. Department of Internal Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea.
10. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Republic of Korea.
11. Department of Internal Medicine, Keimyung University School of Medicine, Keimyung University Kidney Institute, Daegu, Republic of Korea.
12. Department of Internal Medicine, Korea University Ansan Hospital, Ansan, Republic of Korea.
13. Department of Internal Medicine, Inje University College of Medicine, Ilsan-Paik Hospital, Goyang, Republic of Korea.