title: HIV surveillance in hard-to-reach populations.
authors: B
authors: B
authors: Schwartländer
authors: P D
authors: PD
authors: Ghys
authors: E
authors: E
authors: Pisani
authors: S
authors: S
authors: Kiessling
authors: S
authors: S
authors: Lazzari
authors: M
authors: M
authors: Caraël
authors: J M
authors: JM
authors: Kaldor
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology* / Q000635:transmission; D004196:Disease Outbreaks; D005260:Female; D006716:Homosexuality; D006801:Humans; D008297:Male; D011159:Population Surveillance / Q000379:methods*; D011477:Sex Work; D015819:Substance Abuse, Intravenous; D014171:Transients and Migrants