From the Department of Medicine, Hypertrophic Cardiomyopathy Center, Division of Cardiology, Tufts Medical Center, Boston, MA (E.J.R., M.S.K., J.E.U., D.D., M.S.M.); Department of Medicine, the Hypertrophic Cardiomyopathy Center, Minneapolis Heart Institute Foundation, Minneapolis, MN (B.J.M., S.A.C., D.S.F., K.M.H., K.M.H.); Departments of Medicine (Cardiovascular Division) and Radiology, Beth Israel Deaconess Medical Center, Boston, MA (R.H.C.); and Department of Pathology and Medicine, Baylor... (At 2014-11)