Determination of sample sizes for the estimation of Onchocerca volvulus (Filarioidea: Onchocercidae) infection rates in biting populations of Simulium ochraceum sl (Diptera: Simuliidae) and its application to ivermectin control programs - Basanez,MG; Rodriguez-Perez,MA; Reyes-Villanueva,F; Collins,RC; Rodriguez,MH (JOURNAL OF MEDICAL ENTOMOLOGY, 1998)