5Valles J,Pobo A,Garcia-Esquirol O,et al.Excess ICUmortality attributable to ventilator-associated pneumonia:the role of early VS late onset[J].Intensive Care Med,2007,33(8):1363.
5Nava S, Ambrosino N, Clini E, et al. Noninvasive mechanical ventilatzon in the weaning of patients with repiratory failure due to chronic obstructive pulmonary disease. A randomized,controlled trial[J]. Ann Intem Med, 1998; 128(9) :721 - 728.