RT Journal Article SR Electronic T1 Placing a mask on COVID-19 patients during high-flow nasal cannula therapy reduces aerosol particle dispersion JF ERJ Open Research JO erjor FD European Respiratory Society SP 00519-2020 DO 10.1183/23120541.00519-2020 VO 7 IS 1 A1 Jie Li A1 James B. Fink A1 Ahmad A. Elshafei A1 Laurel M. Stewart A1 Hannah J. Barbian A1 Sara H. Mirza A1 Lena Al-Harthi A1 David Vines A1 Stephan Ehrmann YR 2021 UL http://openres.ersjournals.com/content/7/1/00519-2020.abstract AB