RT Journal Article SR Electronic T1 Pre-COVID-19 lung function and other risk factors for severe COVID-19 in first responders JF ERJ Open Research JO erjor FD European Respiratory Society SP 00610-2020 DO 10.1183/23120541.00610-2020 VO 7 IS 1 A1 Weiden, Michael D. A1 Zeig-Owens, Rachel A1 Singh, Ankura A1 Schwartz, Theresa A1 Liu, Yang A1 Vaeth, Brandon A1 Nolan, Anna A1 Cleven, Krystal L. A1 Hurwitz, Karen A1 Beecher, Shenecia A1 Prezant, David J. YR 2021 UL http://openres.ersjournals.com/content/7/1/00610-2020.abstract AB