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4Torres A, Aznar R, Catell JM, et al.Incidence, risk, and prog nosis factors of nosocomial pneumonia in mechanically venti lated patients[J].Am Rev Respir Dis, 1990,142 (3) : 523-528.
5Rello J, Quintana E, Ausina V, et al.Incidence, etiology and outcome of nosocomial pneumonia in mechanically ventilated patients [J ] .Chest, 1991,100 (2) :439-444.
