Correction: Schistosomiais and Soil-Transmitted Helminth Control in Niger: Cost Effectiveness of School Based and Community Distributed Mass Drug Administration. - Jacqueline Leslie; Amadou Garba; Elisa Bosque Oliva; Arouna Barkire; Amadou Aboubacar Tinni; Ali Djibo; Idrissa Mounkaila; Alan Fenwick (Public Library of Science (PLoS), 2012)