RT Journal Article SR Electronic T1 Withdrawal of inhaled corticosteroids in COPD JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 2001684 DO 10.1183/13993003.01684-2020 VO 56 IS 1 A1 Alvar Agusti YR 2020 UL http://erj.ersjournals.com/content/56/1/2001684.abstract AB