RT Journal Article SR Electronic T1 Symptoms and signs plus erythrocyte sedimentation rate or C-reactive protein predicted pneumonia in lower respiratory tract infection JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 55 OP 55 DO 10.1136/ebm.9.2.55 VO 9 IS 2 YR 2004 UL http://ebm.bmj.com/content/9/2/55.abstract AB