title: Chronic migraine: nosographic and epidemiological issues.
authors.affiliation: Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy. giancamillo.manzoni@unipr.it.
authors.forename: Gian Camillo
authors.initials: GC
authors.lastname: Manzoni
authors.affiliation: Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Torelli