RT Journal Article SR Electronic T1 Challenges in interpreting trends in testing for α1-antitrypsin deficiency in COPD patients from UK primary care JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1801986 DO 10.1183/13993003.01986-2018 VO 52 IS 6 A1 Daniel R. Morales YR 2018 UL http://erj.ersjournals.com/content/52/6/1801986.abstract AB