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Refractory chronic migraine: is drug withdrawal necessary before starting a therapy with onabotulinum toxin type A?

Crossref DOI link: https://doi.org/10.1007/s10072-016-2662-2

Published Online: 2016-07-09

Published Print: 2016-10

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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