Received: 19 November 2018
Accepted: 25 July 2019
First Online: 23 August 2019
Ethics approval and consent to participate
: Not applicable. This study was conducted as part of a service improvement procedure and as such did not require separate ethical approval. The work detailed here was approved by relevant authorities at Public Health England and the North Bristol NHS Trust. Data anonymisation was performed at source, prior to analysis in a manner which conformed to the Information Commissioners Office Anonymisation Code of Practice. As stated in the aforementioned documentation, by rendering data anonymous in such a way that subjects described are not identifiable, data protection law no longer applies.
: Not applicable.
: The authors declare that they have no competing interests.