An epidemiological study of headache in an urban and a rural population in northern Finland.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D005387:Finland; D006261:Headache / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012424:Rural Population; D012737:Sex Factors; D014505:Urban Population