1. Aday, L.A., Anderson, R., 1974. A framework for the study of access to medical care. Health Services Res., Fall, 208–220.
2. Andersen, R., Bozzette, S., Shapiro, M., St.Clair, P., Morton, S., Crystal, S., Goldman, D., Wenger, N., Gifford, A., Leibowitz, A., Asch, S., Berry, S., Nakazono, T., Heslin, K., Cunningham, W., and the HCSUS Consortium, 2000. Access of vulnerable groups to antiretroviral therapy among persons in care for HIV disease in the United States. Health Services Res., 35, 389–416.
3. Health-related service utilization and HIV risk behaviors among HIV infected injection drug users and crack smokers;Booth;Drug Alcohol Depend.,1998
4. Centers for Disease Control. (1992, December 18). 1993 revised classification system for HIV infection and expanded surveillance case definition for AIDS among adolescents and adults. Morbidity and Mortality Weekly Report. 41(RR-17).
5. Centers for Disease Control and Prevention, 1998. HIV/AIDS Surveillance: U.S. AIDS Cases Reported Through December 1998. Atlanta, GA: Centers for Disease Control and Prevention.