Viral hepatitis, England and Wales: 1989-91.
D003430:Cross-Sectional Studies; D004739:England / Q000453:epidemiology; D006509:Hepatitis B / Q000453:epidemiology*; D006525:Hepatitis, Viral, Human / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D011159:Population Surveillance; D014852:Wales / Q000453:epidemiology