Funding for this research was provided by:
National Institute for Health Research Biomedical Research Centre at South London and Maudsley NHS Foundation Trust (NIHR-INF-0682)
Received: 2 March 2020
Accepted: 19 June 2020
First Online: 14 July 2020
Ethics approval and consent to participate
: Analysis of fully anonymised data did not require ethical approval.
: Not applicable.
: The authors declare that they have no competing interests.