Expected and observed values for the prescription of vitamin B 12  in England and Wales.
D000748:Anemia, Macrocytic / Q000188:drug therapy; D000752:Anemia, Pernicious / Q000188:drug therapy / Q000453:epidemiology; D003365:Costs and Cost Analysis; D011307:Drug Prescriptions; D004739:England; D006562:Herpes Zoster / Q000188:drug therapy; D006801:Humans; D009103:Multiple Sclerosis / Q000188:drug therapy; D013223:Statistics as Topic; D014805:Vitamin B 12 / Q000008:administration & dosage*; D014852:Wales
D014805:Vitamin B 12