title: Cluster headache and its variants.
authors.affiliation: Department of Neurology and Headache Clinic, Hull Royal Infirmary, UK.
authors.forename: J M
authors.initials: JM
authors.lastname: Pearce
mesh_terms: D003027:Cluster Headache / Q000175:diagnosis* / Q000188:drug therapy / Q000209:etiology; D003937:Diagnosis, Differential; D006801:Humans; D008881:Migraine Disorders / Q000175:diagnosis