Funding for this research was provided by:
Received: 30 October 2019
Accepted: 26 May 2020
First Online: 5 June 2020
Ethics approval and consent to participate
: The Medical Ethical Review Board of the CMO Region Arnhem-Nijmegen reviewed and approved the study protocol (NL58482.091.16). All participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.