van Ling, J. A.
Bökkerink, G. M. J.
de Blaauw, I.
Botden, S. M. B. I. http://orcid.org/0000-0001-9134-5458
Article History
Received: 21 April 2020
Accepted: 19 January 2021
First Online: 27 January 2021
Ethics approval and consent to participate
: No ethical approval was needed for this study, based on national guidelines (ExternalRef removed), because there are no patients involved and no invasive intervention is performed. All participants provided written informed consent for this study.
: Not applicable.
: The authors declare that they have no competing interests.