title: The cluster phenomenon: an unspecific feature?
authors.affiliation: Department of Neurology, Regionsykhuset i Trondheim, Trondheim University Hospital, Norway.
authors.forename: O
authors.initials: O
authors.lastname: Sjaastad
authors.forename: D
authors.initials: D
authors.lastname: de Souza Carvalho
authors.forename: Y D
authors.initials: YD
authors.lastname: Fragoso
mesh_terms: D002908:Chronic Disease; D003027:Cluster Headache / Q000145:classification* / Q000175:diagnosis / Q000503:physiopathology; D003937:Diagnosis, Differential; D005175:Factor XII Deficiency / Q000150:complications / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008881:Migraine Disorders / Q000175:diagnosis / Q000503:physiopathology; D012737:Sex Factors; D014653:Vascular Headaches / Q000145:classification*