1Won SP, Chou HC, Hsieh WS, et al. Handwashing Program for the Prevention of Nosocomial Infection in a Neonatal Intensive Care Unit [J].Infect ControI Hosp Epi- demioI, 2004, 25 (9) : 742 -746.
4Inglis TAJ, Sberratt MJ, Sproat LJ, et al. Gastroduodenal dys - function and bacterial colonization of the ventilated lung[J]. Lan cet,1993,341:911 - 913.