It was highlighted that in the original article  the graphs in Fig. 1 were duplicated. This Correction article shows the correct Fig. 1. The original article has been updated. Author details 1Erasmus University Rotterdam, Erasmus School of Health Policy & Management, P.O. Box 1738, 3000, DR, Rotterdam, the Netherlands. 2Erasmus University Rotterdam, Erasmus School of Economics, Rotterdam, The Netherlands.
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