Additional file 1.

Table S1: Search Strategy. Table S2 (and explanatory text): OQAQ: Quality assessment tool for systematic reviews and meta-analyses. Table S3 (and explanatory text): Evidence Grading System. Table S4: Characteristics of Included Reviews. Table S5: Excluded papers. Table S6: OQAQ scores.

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Greaves et al. BMC Public Health 2011 11:119   doi:10.1186/1471-2458-11-119