RT Journal Article SR Electronic T1 Gibson P. Evidence-based respiratory medicine. Oxford: Blackwell BMJ, 2005. JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 125 OP 125 DO 10.1136/ebm.12.4.125 VO 12 IS 4 A1 Parker, Robert YR 2007 UL http://ebm.bmj.com/content/12/4/125.abstract AB