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Injection sites.
Notes: (a) Procerus muscle; (b) right medial corrugator muscle; (c) left medial corrugator muscle; (d) right lateral corrugator muscle; (e) left lateral corrugator muscle. When subjects were injected with incobotulinumtoxinA or onabotulinumtoxinA, injection sites a, b, and c received 5 U each, while d and e received 3 U each. AbobotulinumtoxinA treatment consisted of 15 U injections at sites a, b, and c, and 9 U at sites d and e.
