Media type: E-Article Title: P045. OnabotulinumtoxinA: long term treatment for chronic migraine with medication overuse Contributor: Guerzoni, Simona; Cainazzo, Maria Michela; Pini, Luigi Alberto imprint: Springer Science and Business Media LLC, 2015 Published in: The Journal of Headache and Pain Language: English DOI: 10.1186/1129-2377-16-s1-a183 ISSN: 1129-2369; 1129-2377 Keywords: Anesthesiology and Pain Medicine ; Neurology (clinical) ; General Medicine Origination: Footnote: Access State: Open Access