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