1. Pneumocystis pneumonia—Los Angeles;Centers for Disease Control;MMWR,1981
2. Global estimates of AIDS and HIV infections: 1990;Chin;AIDS,1990
3. Prevalence of HIV infection in Canada;Schechter,1988
4. Projections of HIV infections and AIDS cases to the year 2000;Chin;Bull World Health Organ,1990
5. Do alternate modes of transmission of human immunodeficiency virus exist?;Lifson;JAMA,1988