Figure 1.

Identification of effective reviews of high quality *some reviews which were included at the request of funder have been excluded from this paper eg economic reviews (n=6) **non significant, non effective or inconclusive reviews, reviews graded 2++,2+ or 2- and medium or low quality reviews are not discussed in this paper.

McNeill et al. BMC Public Health 2012 12:955   doi:10.1186/1471-2458-12-955
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