CD4 and AIDS: First, differences in the eligibility criteria of the studied populations may have affected the outcome; we included subjects with CD4 > 350 cells/μL at baseline and defined HIV/AIDS progression as CD4 < 350 cells/μL, whereas the inclusion criteria used by Li et al. was a CD4 count <350 cells/μL and they defined HIV/AIDS progression as CD4 < 200 cells/μL.