Funding for this research was provided by:
South West London Partnership (-)
Text and Data Mining valid from 2019-08-07
Received: 25 February 2019
Accepted: 19 July 2019
First Online: 7 August 2019
Ethics approval and consent to participate
: Not applicable. This is a review of existing literature: there was no patient or public involvement.
: Not applicable.
: The authors declare that they have no competing interests.