1. From the Department of Cardiology (G.N., N.A.M., M.B., V.D., H.-M.J.S., J.M.v.W., A.J.S., M.J.S., E.E.v.d.W., E.R.H., J.J.B.), Leiden University Medical Center, Leiden, the Netherlands; Department of Cardiopulmonary Sciences (G.N.), University Hospital Santa Maria della Misericordia, Udine, Italy; and the Interuniversity Cardiology Institute of the Netherlands (E.E.v.d.W.), Utrecht, the Netherlands.