PT - JOURNAL ARTICLE AU - Samantha R. Paige AU - Janice L. Krieger TI - Recruitment in online research for COPD: leveraging social media and research registries AID - 10.1183/23120541.00167-2018 DP - 2019 Apr 01 TA - ERJ Open Research PG - 00167-2018 VI - 5 IP - 2 4099 - http://openres.ersjournals.com/content/5/2/00167-2018.short 4100 - http://openres.ersjournals.com/content/5/2/00167-2018.full SO - erjor2019 Apr 01; 5