Cost analysis of centralized viral load testing for antiretroviral therapy monitoring in Nicaragua, a low-HIV prevalence, low-resource setting. - Gerlach, Jay; Sequeira, Magda; Alvarado, Vivian; Cerpas, Christian; Balmaseda, Angel; Gonzalez, Alcides; Santos, Tala de los; Levin, Carol E; Amador, Juan Jose; Domingo, Gonzalo J (Journal of the International AIDS Society, 2010)