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BACKGROUND This is the first well-controlled study of the combined use of botulinum toxin type A (BoNT-A) and botulinum toxin type B (BoNT-B) for hyperkinetic lines in forehead. OBJECTIVE To evaluate the effectiveness and safety of a mixture of BoNT-A and BoNT-B with that of equipotent BoNT-A alone for treating patients with forehead rhytides. MATERIALS(More)
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