Headache in general practice.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005194:Family Practice; D005260:Female; D006261:Headache / Q000453:epidemiology*; D006801:Humans; D008131:London; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D012959:Socioeconomic Factors