Funding for this research was provided by:
Judith Jane Mason and Harold Stannett Williams Memorial Foundation
the Stafford Fox Medical Research Foundation
Received: 17 December 2018
Accepted: 15 October 2019
First Online: 14 November 2019
Consent for publication
: Consent for publication was obtained from all persons involved in the writing and planning of this manuscript.
: The authors declare no conflicts of interest. The lead author affirms that this manuscript is an accurate, honest and transparent account of the study undertaken and reported, with no aspects being omitted and any discrepancies explained. The reporting of this work is compliant with PRISMA guidelines.