1. Cesarean section to reduce perinatal transmission of human immunodeficiency virus;Villari;Online J Curr Clin Trials,1993
2. Risk factors for mother-to-child transmission of HIV-1;European Collaborative Study;Lancet,1992
3. Children born to women with HIV-1 infection: natural history and risk of transmission;European Collaborative Study;Lancet,1991
4. Classification system for human immunodeficiency virus (HIV) infection in children under 13 years of age;Centers for Disease Control;MMWR,1987
5. 1993 revised classification system for HIV infection and expanded surveillance case definition for AIDS among adolescents and adults;Centers for Disease Control;MMWR,1992