Conflict of interest statement
H.L. Hoge, S.E.H. Detert Oude Weme, W.L. Vervenne, I.R.F. van Berlo-van de Laar, C.M.L. van Herpen, L. Roorda, R.A.A. Mathôt, M.S. Jacobs, N.P. van Erp and F.G.A. Jansman have no conflicts of interest that are directly relevant to the content of this study.