Funding for this research was provided by:
Received: 25 June 2019
Accepted: 23 March 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: Ethical approval was not deemed necessary by the local ethics committee [Dutch: Commissie Mensgebonden Onderzoek Arnhem-Nijmegen].
: Written informed consent was obtained for publication of data from participants.
: The authors declare that they have no competing interests.