%0 Journal Article %A Samantha R. Paige %A Janice L. Krieger %T Recruitment in online research for COPD: leveraging social media and research registries %D 2019 %R 10.1183/23120541.00167-2018 %J ERJ Open Research %P 00167-2018 %V 5 %N 2 %U https://openres.ersjournals.com/content/erjor/5/2/00167-2018.full.pdf