RT Journal Article SR Electronic T1 Extrafine triple therapy in patients with symptomatic COPD and history of one moderate exacerbation JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1900235 DO 10.1183/13993003.00235-2019 VO 53 IS 5 A1 Dave Singh A1 Leonardo M. Fabbri A1 Massimo Corradi A1 George Georges A1 Alessandro Guasconi A1 Stefano Vezzoli A1 Stefano Petruzzelli A1 Alberto Papi YR 2019 UL http://erj.ersjournals.com/content/53/5/1900235.abstract AB