Estimated incidence of influenza-virus-associated severe pneumonia in children in El Salvador, 2008-2010.
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M. Widdowson | Xiyan Xu | J. Bresee | A. Klimov | E. Azziz-Baumgartner | Jorge H Jara | Wilfrido Clara | P. Minaya | N. Blanco | R. Chacón | J. Armero | David Rodríguez | C. de Lozano | Luis Bonilla | N. Linares-Pérez | Marc-Alain Widdowson | Nivaldo Linares-Pérez