Funding for this research was provided by:
Ministerie van Volksgezondheid, Welzijn en Sport
Received: 19 January 2019
Accepted: 18 March 2020
First Online: 24 March 2020
Ethics approval and consent to participate
: According to the Dutch Medical Research Involving Human Subjects Act, this study did not require ethics approval. The study did follow the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interest.