Transoral endoscopic thyroidectomy submental vestibular approach for early-stage papillary thyroid carcinoma: a systematic review and meta-analysis.

I 2 test (0–20%) = may not be significant, (30–60%) = maybe represent moderate heterogeneity, (50–90%) = may represent substantial heterogeneity, and (75–100%) considerable heterogeneity, (Cochrane Handbook, Part 2, Chap. 9) [ 33 ].

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