title: [The progression of methods for estimating the size of populations at risk for acquired immunodeficiency syndrome].
authors.affiliation: Depertment of Epidemiology, School of Public Health, Beijing University, Beijing 100083, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Li
authors.forename: Wei-hua
authors.initials: WH
authors.lastname: Cao
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology*; D004812:Epidemiologic Methods; D006801:Humans; D018570:Risk Assessment