1. From the Department of Cardiology, Copenhagen University Hospital, Gentofte (A.-M.S.O., E.L.F., J.L., F.F., M.C., C.S., M.L., J.B.O., P.R.H., C.T.P., G.H.G.); and Department of Cardiology, the Heart Centre, Copenhagen University Hospital, Rigshospitalet (L.K.), Denmark.