title: Secondary headaches introduction.
authors.affiliation: Chair of Neurology, "Sapienza" University of Rome and IRCSS "C. Mondino Institute of Neurology" Foundation, Pavia, Italy. giuseppe.nappi@mondino.it
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Nappi
authors.forename: Michael A
authors.initials: MA
authors.lastname: Moskowitz
mesh_terms: D006261:Headache; D006801:Humans