Figure 5From: Long term outcomes of antiretroviral therapy in a large HIV/AIDS care clinic in urban South Africa: a prospective cohort studyKaplan Meier estimates of first line regimen substitutions during first 4 years of HAART. AZT, zidovudine; NVP, nevirapine; EFZ, efavirenz; d4T, stavudine.Back to article page