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Mayorga Perez, Orlando; Brinkhof, Martin W G; Egger, Matthias; Frösner, Gert; Herzog, Christian; Zwahlen, Marcel (2014). Decreasing risk of hepatitis a infection in león, nicaragua: evidence from cross-sectional and longitudinal seroepidemiology studies. PLoS ONE, 9(2), e87643. Public Library of Science 10.1371/journal.pone.0087643
