RT Journal Article SR Electronic T1 Blood eosinophil counts in COPD patients compared to controls JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1900633 DO 10.1183/13993003.00633-2019 VO 54 IS 4 A1 Kolsum, Umme A1 Southworth, Thomas A1 Jackson, Natalie A1 Singh, Dave YR 2019 UL http://erj.ersjournals.com/content/54/4/1900633.abstract AB