1. From the Division of Cardiology, Department of Internal Medicine, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea (T.-H.K., H.T.Y., E.J., J.-S.U., J.-Y.K., H.-N.P., M.-H.L., B.J)
2. CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea (P.-S.Y.)
3. Institute of Cardiovascular Sciences, University of Birmingham, United Kingdom (G.Y.H.L.).