Received: 15 November 2019
Accepted: 27 January 2020
First Online: 31 January 2020
Ethics approval and consent to participate
: Ethical approval was waived by our medical ethics committee (METc UMC Groningen). We have followed our institutional research guideline (UMCG kaderreglement nWMO, versie 2.0, mei 2017) for educational research. Participants provided written consent.
: Not applicable.
: The authors declare that they have no competing interests.