Fig. 2From: Effectiveness of mesenchymal stem cell-conditioned medium in bone regeneration in animal and human models: a systematic review and meta-analysisRisk of bias in individual studies. Author name and year of publication of each study with their respective result in each item of assessment. Negative sign (−) indicates a high risk, a Question mark (?) indicates not clear risk, a Positive sign (+) indicates low risk of biasBack to article page