Figure 2.

Mapping of themes and subthemes to main findings. To summarise our main findings two review authors took the following three steps: (1) review all main analysis and subgroup analyses documents (left side of figure), (2) group findings into key themes and subthemes. (Middle panel) and (3) expand the concise headings of the key theme and sub-theme headings to include a more specific, detailed description of the phenomenon (right side of figure). The summary of findings statements were reviewed and refined by all authors.