Funding for this research was provided by:
Economic and Social Research Council (ES/L011859/1)
Gwen Fish Charitable Trust
Text and Data Mining valid from 2019-11-27
Received: 17 October 2018
Accepted: 16 October 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: The NJR data were made available after a formal request to the NJR Research Committee. The data were anonymised in respect to patient, to surgeon and to operating unit identifying details. Approval was obtained from Computing Subcommittee of the University of East Anglia Ethics Committee, reference number CMP/1718/F/10A.
: Not applicable.
: The authors declare that they have no competing interest.