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2. Checklists of methodological issues for review authors to consider when including non‐randomized studies in systematic reviews. (22nd March 2013)

6. Issues relating to study design and risk of bias when including non‐randomized studies in systematic reviews on the effects of interventions. (25th September 2012)

7. Methods to estimate the between‐study variance and its uncertainty in meta‐analysis. (2nd September 2015)

9. ROBINS-I: a tool for assessing risk of bias in non-randomised studies of interventions. (12th October 2016)