The evidence review of contextual factors was led by Vera Sistenich and colleagues at Harvard University. For quality assurance, a secondary peer reviewer corroborated paper screening and data extraction.
Data was screened per the following five stages:
Stage One: electronic database search using terms provided outlined in section 3.2.3 and in Appendices 1-7; number of results to be recorded and downloaded into an Endnote file (one per contextual factor), and duplicates removed.
Stage Two: title and abstract review to remove studies not meeting the inclusion criteria (see above).
Stage Three: manuscript/report review to remove studies that do not meet inclusion criteria.
Stage Four: review of references (taken from papers reviewed in Stage Three)
Stage Five: final paper selection, data extraction, and quality assessment.
Data was extracted based on specific research points noted below and input into a standardised Excel data extraction form:
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