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. 2016 Oct 12;355:i4919. doi: 10.1136/bmj.i4919

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

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graphic file with name stej032658.f1_default.jpg — Fig 1 Summary of the process of assessing risk of bias in a systematic review of non-randomised studies of interventions (NRSI)