1. From the Department of Cardiology, Leiden University Medical Center, Leiden (G.B.B., S.A.M., E.R.H., N.V.D.V., C.Y., E.E.v.d.W., M.J.S., J.J.B.); Interuniversity Cardiology Institute Netherlands, Utrecht (G.B.B.); and Department of Epidemiology and Statistics, Erasmus University, Erasmus (E.B.), the Netherlands.