title: Painful issues in head pain classification.
authors.affiliation: Department of Clinical Oral Physiology, School of Dentistry, Aarhus University, Vennelyst Boulevard 9, DK-8000 Aarhus, Denmark.
authors.forename: Peter
authors.initials: P
authors.lastname: Svensson
mesh_terms: D006261:Headache / Q000145:classification* / Q000175:diagnosis*; D006801:Humans