[The current status of nosocomial pneumonia].
Yin
B Y
BY
Qian
B G
BG
D003428:Cross Infection / Q000188:drug therapy / Q000209:etiology / Q000382:microbiology; D006801:Humans; D011014:Pneumonia / Q000209:etiology / Q000382:microbiology; D011379:Prognosis; D012307:Risk Factors