1. Department of Internal Medicine, Hallym University College of Medicine, Seoul, Republic of Korea
2. Division of Nephrology, Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
3. Department of Internal Medicine, Kyung Hee University College of Medicine, Seoul, Republic of Korea
4. Depatment of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Republic of Korea
5. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
6. Kim Seong Nam Internal Medicine Clinic, Seoul, Republic of Korea
7. Gojan Myeong Internal Medicine Clinic, Ansan, Republic of Korea
8. Department of Internal Medicine, Bundang Jesaeng General Hospital, Seongnam, Republic of Korea