RT Journal Article SR Electronic T1 Phenotyping acute exacerbation of COPD: what more can we do for hospitalised patients? JF ERJ Open Research JO erjor FD European Respiratory Society SP 00362-2021 DO 10.1183/23120541.00362-2021 VO 7 IS 3 A1 Cen, Lai-Jian A1 Zhang, Xiao-xian A1 Guan, Wei-Jie YR 2021 UL http://openres.ersjournals.com/content/7/3/00362-2021.abstract AB