1. Department of Internal Medicine, Dongguk University Gyeongju Hospital, Gyeongju, Korea
2. Department of Internal Medicine, Gangneung Dongin Hospital, Gangneung, Korea
3. Department of Internal Medicine, J Hospital, Seongnam, Korea
4. Division of Nephrology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
6. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
7. School of Medicine, Inha University, Incheon, Korea
8. Department of Prevention and Management, Inha University Hospital, Incheon, Korea
9. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
10. Department of Internal Medicine, Inje University College of Medicine, Busan, Korea
11. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea