1. From Landspitali–The National University Hospital of Iceland, Reykjavik, Iceland (B.A., R.D.); Faculty of Medicine (B.A., K.S., G.T.G.) and School of Engineering and Natural Sciences (D.F.G.), University of Iceland, Reykjavik, Iceland; Department of Genetics, Harvard Medical School, Boston, MA (P.T., M.A.B., S.R.D., E.M., B.M., J.G.S., C.E.S.); Hypertrophic Cardiomyopathy Center, Minneapolis Heart Institute Foundation, Minneapolis, MN (B.J.M.); Cardiovascular Division, Brigham and Women’s Hospital,...