RT Journal Article SR Electronic T1 Objective cough frequency monitoring in real-world practice JF ERJ Open Research JO erjor FD European Respiratory Society SP 00545-2021 DO 10.1183/23120541.00545-2021 VO 7 IS 4 A1 Ji-Hyang Lee A1 Woo-Jung Song A1 Eva Millqvist A1 Alyn H. Morice YR 2021 UL http://openres.ersjournals.com/content/7/4/00545-2021.abstract AB