Received: 30 August 2019
Accepted: 17 March 2021
First Online: 29 April 2021
: Under Dutch law, approval from a medical ethics committee or social/societal ethical committee was not required for this study as the participants were mentally competent, they were not subject to the imposition of a certain kind of behaviour and they were not subjected to burdensome interventions or measurements (ExternalRef removed).All participants gave their informed consent in writing. In the case of illiterate participants, a research assistant who spoke their mother tongue read out the information letter and consent form.
: Not Applicable.
: The authors declare that they have no competing interests.