1. Centers for Disease Control and Prevention. Publicly funded HIV counselling and testing —United States 1990.MMWR 1991; 40:666–675.
2. Higgins DL, Galavotti C, O'Reilly KR, et al. Evidence for the effects of HIV antibody counselling and testing on risk behaviors.JAMA 1991; 266:2419–2429.
3. Centers for Disease Control and Prevention. Recommendations for HIV testing services for inpatients and outpatients in acute-care hospital settings and technical guidance on HIV counselling. MMWR 1993; 42 (RR-2).
4. Horsburgh CR, Ou CY, Jason J, et al. Duration of human immunodeficiency virus infection before detection of antibody.Lancet 1989; 2:637–640.
5. Koblin B, Noone S, McCusker J, et al. Contributed paper on Worcester AIDS Consortium for: Coordinated community programs for HIV prevention among intravenous drug users—California Massachusetts.MMWR 1989; 38:369–374.