Fig. 2From: Optimal dose of perineural dexmedetomidine to prolong analgesia after brachial plexus blockade: a systematic review and Meta-analysis of 57 randomized clinical trialsRisk of bias summary. Review authors’ judgements about each risk of bias item for each included study. Green circle, low risk of bias; orange circle, high risk of bias; yellow circle, unclear risk of biasBack to article page