PT - JOURNAL ARTICLE AU - Irem Patel TI - Exacerbations of chronic obstructive pulmonary disease: definition, aetiology and management AID - 10.7861/clinmedicine.9-2-170 DP - 2009 Apr 01 TA - Clinical Medicine PG - 170--173 VI - 9 IP - 2 4099 - http://www.rcpjournals.org/content/9/2/170.short 4100 - http://www.rcpjournals.org/content/9/2/170.full SO - Clin Med2009 Apr 01; 9