1. Department of Cardiology, Maastricht University Medical Centre, The Netherlands (A.M.W.v.S., H.J.G.M.C., K.V.).
2. Department of Cardiology, University Medical Centre Utrecht, The Netherlands (I.t.H., M.M.).
3. Department of Cardiology, University Medical Centre Groningen, University of Groningen, The Netherlands (M.K., M.R., I.C.v.G., A.H.M.).
4. Department of Physiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, The Netherlands (E.B.E., H.J.G.M.C., F.W.P., K.V.).
5. Department of Medical Physiology, University of Utrecht, The Netherlands (M.A.V.).
6. Department of Cardiology, Radboud University Medical Centre, Nijmegen, The Netherlands (K.V.).