Article History
Received: 13 September 2018
Accepted: 17 January 2020
First Online: 29 January 2020
Ethics approval and consent to participate
: Following discussion with the local Buckinghamshire NHS Trust Research & Innovation Committee, ethics approval was not required for a retrospective study of anonymised outcomes at our institution and was therefore waived. The data was anonymised after collection.
: Not applicable.
: The authors declare that they have no competing interests.