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 Li, Jie A1 Fink, James B. A1 Elshafei, Ahmad A. A1 Stewart, Laurel M. A1 Barbian, Hannah J. A1 Mirza, Sara H. A1 Al-Harthi, Lena A1 Vines, David A1 Ehrmann, Stephan YR 2021 UL http://openres.ersjournals.com/content/7/1/00519-2020.abstract AB