1. Randomized trials or observational tribulations?;Pocock,2000
2. Use of observational databases to evaluate the effectiveness of antiretroviral therapy for HIV infection;Phillips,1999
3. Legal and political considerations of clinical practice guidelines;Hurwitz,1999
4. Determinants of sustainable CD4 lymphocyte count increases in response to antiretroviral therapy;Staszewski,1999
5. Surrogacy in HIV-1 clinical trials;Pozniak,1998