1. Cardiovascular Center, Seoul National University Hospital, Republic of Korea (J.-K.H., D.H., S.Y., S.-H.P., J.K., H.-M.Y., K.W.P., H.-J.K., B.-K.K., H.-S.K.).
2. Department of Internal Medicine, College of Medicine, Seoul National University, Republic of Korea (J.-K.H., H.-M.Y., K.W.P., H.-J.K., B.-K.K., H.-S.K.).
3. Department of Internal Medicine, Keimyung University Dongsan Hospital, Daegu, Republic of Korea (S.-H. Hur).
4. Division of Cardiology, Department of Internal Medicine, Kyung Hee University Hospital, Seoul, Republic of Korea (W.K.).
5. Department of Internal Medicine, Cardiovascular Center, Seoul Medical Center, Republic of Korea (S.Y.K.).
6. Department of Internal Medicine, Daejeon Eulji Medical Center, Eulji University School of Medicine, Daejeon, Republic of Korea (S.-H.P.).
7. Division of Cardiology, Department of Internal Medicine, Gachon University Gil Hospital, Incheon, Republic of Korea (S.H. Han).
8. Division of Cardiology, Department of Internal Medicine, Seoul National University Boramae Medical Center, Republic of Korea (S.-H.K.).
9. Department of Cardiology, Seoul Hospital, Ewha Womans University College of Medicine, Republic of Korea (S.S.).
10. Division of Cardiology, Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Republic of Korea (Y.H.K.).
11. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Republic of Korea (K.P.).
12. Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital, Seoul, Republic of Korea (N.L.).
13. Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Cheonan Hospital, Republic of Korea (S.J.L.).
14. Cardiovascular Center, Guro Hospital Korea University, Seoul, Republic of Korea (J.W.K.).