RT Journal Article SR Electronic T1 Ingenuity during the COVID-19 pandemic: a controlled experiment for respirator mask efficacy testing JF BMJ Innovations JO BMJ Innov FD All India Institute of Medical Sciences SP 288 OP 291 DO 10.1136/bmjinnov-2020-000514 VO 7 IS 2 A1 Michael Hausman A1 Danil Rybalko A1 Philip Nasser A1 Damien Laudier A1 Daniel Charen A1 Emily Ferreri A1 James Iatridis A1 Leesa Galatz YR 2021 UL http://innovations.bmj.com/content/7/2/288.abstract AB