Funding for this research was provided by:
Received: 30 April 2019
Accepted: 5 December 2019
First Online: 17 December 2019
Ethics approval and consent to participate
: This study did not require review by an ethics committee under the Dutch Medical Research Involving Human Subjects Act, since it did not involve imposing any interventions or actions and no patients were involved [CitationRef removed]. Informed consent was assumed on return of the survey.
: Not applicable.
: The authors declare that they have no competing interests.