1. From the Department of Clinical and Experimental Cardiology, Academic Medical Center, Amsterdam, The Netherlands (V.M.F.M., C.E.C., T.O., C.N.W.B., J.M.T.d.B., R.C.); Department of Medical Physiology, University Medical Center, Utrecht, The Netherlands (T.O.); and Interuniversity Cardiology Institute of the Netherlands, Utrecht, The Netherlands (J.M.T.d.B.).