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OLQ.0B013E31828B2F77
OLQ.0B013E31828B2F77
http://dx.doi.org/10.1097/OLQ.0B013E31828B2F77
Biological markers of sexual activity: tools for improving measurement in HIV/sexually transmitted infection prevention research.
P356
Q37267011-1A5665B0-1F69-4465-AE83-535FB63E29F7
P356
OLQ.0B013E31828B2F77
http://dx.doi.org/10.1097/OLQ.0B013E31828B2F77