title: Is the clinical course of HIV infection changing? Exclusion of people not followed up for 12 months may have biased results.
authors.forename: M G
authors.initials: MG
authors.lastname: Law
authors.forename: J M
authors.initials: JM
authors.lastname: Kaldor
mesh_terms: D015982:Bias; D018791:CD4 Lymphocyte Count; D018450:Disease Progression; D005500:Follow-Up Studies; D015658:HIV Infections / Q000401:mortality*; D006801:Humans