Community studies of the prevalence of headache.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D005260:Female; D006261:Headache / Q000453:epidemiology*; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D008881:Migraine Disorders / Q000453:epidemiology*; D012737:Sex Factors; D014653:Vascular Headaches / Q000453:epidemiology; D014852:Wales