1 Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD (S.A.M., B.A., B.M., C.T., A.G., R.T.C., H.C., C.A.J.).
2 Department of Cardiology, University Medical Center Utrecht, the Netherlands. (S.A.M., M.I.F.J.O., A.S.J.M.t.R.).