Fig. 2From: Cytokine-induced killer cell/dendritic cell combined with cytokine-induced killer cell immunotherapy for treating advanced gastrointestinal cancerRisk-of-bias assessments for the randomized trials included in the meta-analysis. a Risk-of-bias summary. b Risk-of-bias graph. Symbols: (+), Low risk of bias; (?), unclear risk of bias; and (−), high risk of biasBack to article page