Additional file 3.
Quality appraisal of papers found using The NCAW. Table summarising the points of The Newcastle Critical Appraisal Worksheet that each study met or did not meet during quality assessment following assessment by two independent assessors with resolution of any disagreements occurring through the use of a third independent assessor.
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Cottrell et al. BMC Family Practice 2010 11:4 doi:10.1186/1471-2296-11-4