RT Journal Article SR Electronic T1 C reactive protein testing to guide antibiotic therapy for COPD exacerbations JF BMJ Evidence-Based Medicine JO BMJ EBM FD BMJ Publishing Group Ltd SP 182 OP 182 DO 10.1136/bmjebm-2019-111294 VO 25 IS 5 A1 Annette Pluddemann YR 2020 UL http://ebm.bmj.com/content/25/5/182.abstract AB