Transformation of episodic migraine into daily headache: analysis of factors.
D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006261:Headache / Q000209:etiology* / Q000523:psychology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008881:Migraine Disorders / Q000150:complications*