1. Vaccines to prevent viral hepatitis;Lemon;N Engl J Med,1997
2. Epidemiology of hepatitis A: Seroepidemiology and risk groups in the USA;Shapiro;Vaccine,1992
3. Hepatitis A among drug abusers;Centers for Disease Control;MMWR,1988
4. Hepatitis A among homosexual men—United States, Canada, and Australia;MMWR,1992
5. Hepatitis in pregnancy;American College of Obstetricians and Gynecologists;ACOG Tech Bull,1992