1. Department of Internal Medicine, Yonsei University College of Medicine, Institute of Kidney Disease Research , Seoul , Republic of Korea
2. Department of Internal Medicine, Yonsei University College of Medicine, Yongin Severance Hospital , Yongin , Republic of Korea
3. Department of Preventive Medicine, Seoul National University College of Medicine , Seoul , Republic of Korea
4. Department of Internal Medicine, Seoul National University Bundang Hospital , Seongnam , Republic of Korea
5. Department of Internal Medicine, Gachon University Gil Medical Center , Incheon , Republic of Korea
6. Department of Internal Medicine, Catholic University of Korea, College of Medicine , Seoul , Republic of Korea
7. Department of Internal Medicine, Seoul National University, College of Medicine , Seoul , Republic of Korea