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In 2013 the Italian Pharmacy Agency (AIFA) approved onabotulinumtoxin A injection to prevent headaches in adult patients with chronic migraine (headaches on at least 15 days per month of which at least 8 days are with migraine) that has not responded to at least three prior pharmacological prophylaxis therapies and whose condition is appropriately managed for medication overuse. In the present paper...
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