Review of botulinum toxin type A for the prophylactic treatment of chronic daily headache.

Neuropsychiatr Dis Treat · 2007 · PMC2656318 · PMID 19300611

Europe PMC DOI

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a positive trendno p-value reported

In some secondary endpoints such as headache intensity or headache duration, a positive trend or significant subgroup analysis could be observed.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.