title: [The prevalence characteristics and risk factors of AIDS among people fifty years or older, at home and abroad].
authors.affiliation: School of Public Health, Peking Union Medical College, Beijing, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.forename: Lu
authors.initials: L
authors.lastname: Wang
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology*; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors; D012725:Sexual Behavior / Q000706:statistics & numerical data*