Additional file 5.

Cochrane risk of bias figure. Risk of bias present in the trials included in this review based on the Cochrane risk of bias tool. Judgements about each risk of bias item are presented as percentages across the 21 included trials. The green bars represent the percentage of trials rated as high quality (low risk of bias) on each item, the yellow bars represent the percentage of trials where judgements could not be made (unclear risk of bias) on each item, and the red bars represent the percentage of trials rated as poor quality (high risk of bias) on each item.

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Hobbs et al. BMC Medicine 2013 11:75   doi:10.1186/1741-7015-11-75