Funding for this research was provided by:
Newcastle University
Article History
Received: 5 June 2019
Accepted: 13 August 2019
First Online: 30 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: As this study was entirely retrospective and observational, ethical approval was not necessary.
: For the same reason, and because no patient identifiable information is included, patient consent was not necessary.