1. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
2. Department of Internal Medicine, Ewha Womans University Seoul Hospital, Ewha Womans University College of Medicine, Seoul, Republic of Korea
3. Department of Internal Medicine, College of Medicine, Institute of Kidney Disease Research, Yonsei University, Seoul, Republic of Korea
4. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
5. Division of Nephrology, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
6. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
7. Seoul National University Cancer Research Institute, Seoul, Republic of Korea
8. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Republic of Korea