Three-Dimensional Photogrammetric Assessment of Facial Symmetry Improvement Following Botulinum Toxin Treatment in Patients with Facial Palsy: An Observational Study.

First, the sample size was relatively small (16 patients), although the results were highly significant ( p < 0.001) for nearly all comparisons, with medium-to-large effect sizes (Cohen’s d 0.5–1.20), suggesting that the statistical power was likely sufficient.

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