1. From the Cardiology Division (K.K., T.Y., L.X., I.M., R.W.Y., I-K.J.) and the Biostatistics Center (H.L.), Massachusetts General Hospital, Harvard Medical School, Boston, MA; the Department of Cardiology, College of Medicine, Kyung Hee University, Seoul, Korea (S-J.K.); Cardiovascular Medicine/Intervention and Structural Heart Disease, Wellmont CVA Heart Institute, Kingsport, TN (R.S.); LightLab Imaging Inc/St Jude Medical. Westford, MA (S.Z.); Visiting Professor of Harbin Medical University, First...