1. Department of Cardiothoracic Surgery (J.R.G.E., S.A.H., P.G., B.P., G.P., A.J.J.C.B., J.J.M.T.), Erasmus University Medical Center, Rotterdam, The Netherlands.
2. Erasmus School of Health Policy & Management, Erasmus University Rotterdam, Rotterdam, The Netherlands (S.A.H.).
3. Department of Biostatistics (G.P.), Erasmus University Medical Center, Rotterdam, The Netherlands.
4. Department of Cardiology (J.W.R.H.), Erasmus University Medical Center, Rotterdam, The Netherlands.