RT Journal Article SR Electronic T1 Ventilator-associated pneumonia: when is a pathogen not a pathogen? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 774 OP 775 DO 10.1136/thoraxjnl-2017-209997 VO 72 IS 9 A1 Michael J Cox YR 2017 UL http://thorax.bmj.com/content/72/9/774.abstract AB