Vitamin B 12  deficiency in a general medical clinic.
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014768:Virginia; D014805:Vitamin B 12 / Q000097:blood; D014806:Vitamin B 12 Deficiency / Q000150:complications / Q000453:epidemiology*
D014805:Vitamin B 12