Unilaterality of headache. Hauge's studies revisited.
D002533:Cerebral Angiography; D006261:Headache / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D008881:Migraine Disorders / Q000175:diagnosis* / Q000000981:diagnostic imaging; D010146:Pain / Q000175:diagnosis; D014711:Vertebral Artery / Q000000981:diagnostic imaging