Usefulness of sputum gram stain for etiologic diagnosis in community-acquired pneumonia: a systematic review and meta-analysis by Gaspar Del Rio-Pertuz, Juan F. Gutiérrez, Abel J. Triana, Jorge L. Molinares, Andrea B. Robledo-Solano, José L. Meza, Orlando M. Ariza-Bolívar, Jorge Acosta-Reyes, Argenis Garavito, Diego Viasus, Jordi Carratalà

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