Received: 5 March 2019
Accepted: 14 August 2019
First Online: 5 September 2019
Change Date: 17 June 2020
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via the original article.
Ethics approval and consent to participate
: For this study, the Medical Ethics Review Committee of VU University Medical Center Amsterdam, the Netherlands, granted an exemption from ethics approval. To ensure compliance with the rules laid down by the Declaration of Helsinki, participants were told that their participation in the study was voluntary, there was a guarantee of confidentiality and anonymity, and that non-participation would not cause them any harm. Before participants could start the online questionnaire, they were informed about the research protocol and had to give their written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.