title: P057. Prophylaxis with low-dose methadone in patients affected by daily refractory headache and medication-overuse headache: a prospective cohort study (METACEF study).
authors.affiliation: Headache Centre, Careggi University Hospital, University of Florence, Florence, Italy. chiara.lupi@unifi.it.
authors.forename: Chiara
authors.initials: C
authors.lastname: Lupi
authors.affiliation: Toxicology Unit, Careggi University Hospital, Florence, Italy.
authors.forename: Chiara
authors.initials: C
authors.lastname: Pracucci
authors.affiliation: Headache Centre, Careggi University Hospital, University of Florence, Florence, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: De Cesaris
authors.affiliation: Headache Centre, Careggi University Hospital, University of Florence, Florence, Italy.
authors.forename: Eleonora
authors.initials: E
authors.lastname: Rossi
authors.affiliation: Headache Centre, Careggi University Hospital, University of Florence, Florence, Italy.
authors.forename: Pierangelo
authors.initials: P
authors.lastname: Geppetti
authors.affiliation: Headache Centre, Careggi University Hospital, University of Florence, Florence, Italy.
authors.forename: Silvia
authors.initials: S
authors.lastname: Benemei
authors.affiliation: Toxicology Unit, Careggi University Hospital, Florence, Italy.
authors.forename: Valentina
authors.initials: V
authors.lastname: Galli
authors.affiliation: Toxicology Unit, Careggi University Hospital, Florence, Italy.
authors.forename: Brunella
authors.initials: B
authors.lastname: Occupati
authors.affiliation: Toxicology Unit, Careggi University Hospital, Florence, Italy.
authors.forename: Viola
authors.initials: V
authors.lastname: Mazzucco
authors.affiliation: Toxicology Unit, Careggi University Hospital, Florence, Italy.
authors.forename: Guido
authors.initials: G
authors.lastname: Mannaioni