Efficacy of cannabis-based medicine in the treatment of Tourette syndrome: a systematic review and meta-analysis.

The Cochrane Handbook’s guidelines for meta-analysis were followed when interpreting the I-square test (0–30% = may not be significant, 30–60% = may represent moderate heterogeneity, 60–90% = may represent substantial heterogeneity, and 75–100% = significant heterogeneity) and a p value < 0.05.

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