Limitations
There are limitations of this review that require acknowledgement. Firstly, widening the search period to allow for research pre 2006 would have resulted in more papers eligible for inclusion. However, due to resourcing and time restraints, review of more than 12 papers was not manageable and was beyond the scope of this review. Excluding papers on a language basis (only including those written in English) may have also impacted the findings of this review and high quality and relevant findings may have inadvertently been missed as a result of the inclusion/exclusion criteria. Lastly, as previously identified, the findings of the review are in part dependent on the choice of critical appraisal tool and the application of other critical appraisal tools to the same literature may have yielded different results.