PT - JOURNAL ARTICLE AU - Mannino, David M. TI - Biomarkers in COPD: the search continues! AID - 10.1183/09031936.00236314 DP - 2015 Apr 01 TA - European Respiratory Journal PG - 872--874 VI - 45 IP - 4 4099 - http://erj.ersjournals.com/content/45/4/872.short 4100 - http://erj.ersjournals.com/content/45/4/872.full SO - Eur Respir J2015 Apr 01; 45