title: Recognition of nosocomial pneumonia in the intensive care unit: still a confusing issue.
authors.forename: Marin H
authors.initials: MH
authors.lastname: Kollef
mesh_terms: D003428:Cross Infection / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D007362:Intensive Care Units; D011014:Pneumonia / Q000453:epidemiology*; D012307:Risk Factors; D014481:United States / Q000453:epidemiology