| the cost-effectiveness of a competitive voucher scheme to reduce sexually transmitted infections in high-risk groups in nicaragua. | current evidence suggests that sexually transmitted infection (sti) interventions can be an effective means of human immunodeficiency virus (hiv) prevention in populations at an early stage of the epidemic. however, evidence as to their cost-effectiveness when targeted at high-risk groups is lacking. this paper assesses the cost-effectiveness of a competitive voucher scheme in managua, nicaragua aimed at high-risk groups, who could redeem the vouchers in exchange for free sti testing and treatme ... | 2005 | 15965034 |