4Neora P,Anne M ,Nancy B ,et al. Puimonary Aspiration In Aliong- Term Care Setting:Clincial And Laboratory Observations And An Analysis Of Risk Factors[J]. The American Geriatrics Society,1996,44:763 ~768.
5Stephen A, Mcclave MD,Leslie K,et al. Enteare tube feeding in the intensive care unit: factors impeding adequate delivery [ J ]. Cdt care med, 1999,27 (7): 1252 ~ 1256.
6Drakulovic MB,Torres A,Bauer TT. Supine body position as a risk factor for nosocomial pneumonia in mechanically ventilated patients:a randomized trial [ J ]. Lancet, 1999,27 ( 11 ): 1851 ~ 1858.