Illinois to conduct two-year experiment with coded IDs.
D003219:Confidentiality; D018563:Disease Notification / Q000331:legislation & jurisprudence*; D015658:HIV Infections / Q000453:epidemiology*; D006801:Humans; D007087:Illinois / Q000453:epidemiology; D010355:Patient Identification Systems; D011159:Population Surveillance / Q000379:methods*