Received: 14 May 2020
Accepted: 24 November 2020
First Online: 10 December 2020
Ethics approval and consent to participate
: This study was registered at the University College UCL legal services for use with the Danish Data Protection Agency. Ethics approval was not needed according to national regulations (see ExternalRef removed). Written informed consent was obtained before any gathering of data.
: Not applicable.
: The authors declare that they have no competing interests.