Skin displacement analysis (SDA): a tool for the quantitative evaluation of skin movements elicited by underlying muscles in the face and neck area.

Specifically, relative to Day 0, the maximum horizontal skin displacement 30 mm lateral to the midline showed a time-dependent and highly significant ( P < 0.001) reduction to a mean (±SD) of 62% ±23% at Day 2, and a further reduction to 17% ± 16% at Day 7 ( Table 2 ).

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