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Handling editor Mary Frances McMullin.
Contributors KD, DMT and KO’H performed the audit. KD carried out the statistical tests. KD drafted the paper. RF, MJ, EV and DMT were responsible for critical revision of the paper. JW, GC and YC performed the tests.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.