[Studies on chronic headache--with particular reference to dysrhythmic headache].
D000367:Age Factors; D002908:Chronic Disease; D004569:Electroencephalography; D005260:Female; D006261:Headache / Q000150:complications / Q000188:drug therapy / Q000235:genetics / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008881:Migraine Disorders / Q000503:physiopathology; D012737:Sex Factors