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 Michael D. Weiden A1 Rachel Zeig-Owens A1 Ankura Singh A1 Theresa Schwartz A1 Yang Liu A1 Brandon Vaeth A1 Anna Nolan A1 Krystal L. Cleven A1 Karen Hurwitz A1 Shenecia Beecher A1 David J. Prezant YR 2021 UL http://openres.ersjournals.com/content/7/1/00610-2020.abstract AB