A National Baseline Prevalence Survey of Schistosomiasis in the Philippines Using Stratified Two-Step Systematic Cluster Sampling Design by Lydia Leonardo, Pilarita Rivera, Ofelia Saniel, Elena Villacorte, May Antonnette Lebanan, Bobby Crisostomo, Leda Hernandez, Mario Baquilod, Edgardo Erce, Ruth Martinez, Raman Velayudhan

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