1. 1 WHO .Hepatitis B. Fact SheetWHO/204. November 1998 .
2. The discovery of the hepatitis viruses
3. 3 Chinese Ministry of Health . Health News .Newspaper of Health News22/01/99, 4th edn, 1999 .
4. Current therapeutic trends in therapy for chronic viral hepatitis
5. 5 BS Blumberg . Hepatitis B virus: search for plant-derived antiviral . In: Tomlinson TR, Akerele D, eds.Medical Plants - Their Role in Health and Biodiversity. Philadelphia: University of Pennsylvania Press, 1998: 7.