Van den Nieuwenhof, N.
Willemsen, R. T. A.
Konings, K. T. S.
Stoffers, H. E. J. H.
Article History
First Online: 19 February 2020
Conflict of interest
: N. Van den Nieuwenhof, R.T.A. Willemsen, K.T.S. Konings and H.E.J.H. Stoffers declare that they have no competing interests.
: The Medical Research Ethics Committee of Maastricht University (project no. 16-4-010) approved the study.