1. Departments of Cardiology (R.R., M.S., M.V., S.K., G.E.L., L.T., S.Z.R., A.O.K., P.A., P.A.D., P.S.), University Medical Center Utrecht, The Netherlands.
2. Department of Cardiology, Zuyderland Medical Center, Heerlen, The Netherlands (M.S.).
3. Biostatistics and Research Support (R.v.d.B., K.R.), University Medical Center Utrecht, The Netherlands.
4. National Institute of Cardiac Surgery and Interventional Cardiology, Luxembourg (P.F., B.P.).
5. Farr Institute of Health Informatics, University College London, United Kingdom (S.K.).
6. Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands (P.A.).