Funding for this research was provided by:
Action Medical Research (GN2506)
Received: 3 December 2019
Accepted: 5 May 2020
First Online: 14 May 2020
Ethics approval and consent to participate
: No ethical approval was required for this study, since it used only previously collected, fully anonymised research data.
: Not applicable.
: The authors declare that they have no competing interest.