PT - JOURNAL ARTICLE AU - Milne, Stephen AU - Eddy, Rachel L. AU - Sin, Don D. TI - Disease activity in COPD: time to make imaging biomarkers a PET project? AID - 10.1183/23120541.00445-2021 DP - 2021 Jul 01 TA - ERJ Open Research PG - 00445-2021 VI - 7 IP - 3 4099 - http://openres.ersjournals.com/content/7/3/00445-2021.short 4100 - http://openres.ersjournals.com/content/7/3/00445-2021.full SO - erjor2021 Jul 01; 7