title: O068. A 2 years prospective evaluation study on onabotulinumtoxinA 195 U in chronic migraine.
authors.affiliation: Department of Clinical and Molecular Medicine, Sapienza University of Rome, Sant'Andrea Hospital, Rome, Italy. andrea.negro@uniroma1.it.
authors.forename: Andrea
authors.initials: A
authors.lastname: Negro
authors.affiliation: Department of Clinical and Molecular Medicine, Sapienza University of Rome, Sant'Andrea Hospital, Rome, Italy.
authors.forename: Lidia
authors.initials: L
authors.lastname: D'Alonzo
authors.affiliation: Department of Clinical and Molecular Medicine, Sapienza University of Rome, Sant'Andrea Hospital, Rome, Italy.
authors.forename: Noemi
authors.initials: N
authors.lastname: Lala
authors.affiliation: Department of Clinical and Molecular Medicine, Sapienza University of Rome, Sant'Andrea Hospital, Rome, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Martelletti