ß-lactam antibiotics to prevent ventilator-associated pneumonia (VAP) in coma patients: A systematic review and meta-analysis of randomized controlled trials Edinson Dante Meregildo-Rodriguez; Mariano Ortiz-Pizarro; Martha Genara Asmat-Rubio; Carlos Geraldo Fernandez-Narváez; Gustavo Adolfo Vásquez-Tirado;

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