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This meta‐analysis evaluated the frequency of neutralizing antibody (nAb) conversion with onabotulinumtoxinA (BOTOX®; Allergan) across five studied indications. The analysis was based on large, controlled or prospective, open‐label trials (durations 4 months to ≥2 years). Serum samples were analyzed for nAbs using the Mouse Protection Assay. Subjects who were antibody negative at baseline and had...
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