1. From the Department of Medicine (R.V.S., A.C.T., M.H.P., J.L.J.), Cardiology Division (A.C.T., M.H.P., J.L.J.), Massachusetts General Hospital, Harvard Medical School, Boston; and Department of Cardiology (R.R.J.v.K.), University Hospital Maastricht, AZ Maastricht, The Netherlands.