title: P045. OnabotulinumtoxinA: long term treatment for chronic migraine with medication overuse.
authors.affiliation: Headache and Drug Abuse Inter-Department Research Centre, University of Modena e Reggio Emilia, Modena, Italy. simona_guerzoni@libero.it.
authors.forename: Simona
authors.initials: S
authors.lastname: Guerzoni
authors.affiliation: Headache and Drug Abuse Inter-Department Research Centre, University of Modena e Reggio Emilia, Modena, Italy.
authors.forename: Maria Michela
authors.initials: MM
authors.lastname: Cainazzo
authors.affiliation: Headache and Drug Abuse Inter-Department Research Centre, University of Modena e Reggio Emilia, Modena, Italy.
authors.forename: Luigi Alberto
authors.initials: LA
authors.lastname: Pini