Voeten, H.A.C.M.

study health sex workers women condom partner patient client worker kenya infection group disease behaviour condom use people education population prevalence nairobi country provider hiv prevalence intervention treatment netherland std case management africa information chinese clinic management hiv infection knowledge result table behavior number transmission prevention hepatitis research interview control kisumu school nyanza hepatitis b perception vaccination community difference facility score contact level quality survey measure factor parent respondent outbreak std care chapter nyanza province healer observation disco funerals youth health education method relationship sub-saharan africa influenza response resident funeral risk perception teacher