AIDS and Behavior In AIDS and Behavior, Vol. 12, No. 1. , pp. 97-104, doi:10.1007/s10461-008-9390-4 Obtaining samples of populations at risk for HIV challenges surveillance, prevention planning, and evaluation.
http://www.citeulike.org/user/shanthim/article/2722393
http://www.citeulike.org/user/shanthim/article/2722393
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