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Ballard DH, Dang AJ, Kumfer BM, et al. Protection levels of N95-level respirator substitutes proposed during the COVID-19 pandemic: safety concerns and quantitative evaluation procedures. BMJ Open 2021;11:e045557. doi: 10.1136/bmjopen-2020-045557. This article was published in BMJ Open following peer review and can also be viewed on the journal’s website at http://bmjopen.bmj.com.
© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. http://creativecommons.org/licenses/by-nc/4.0/This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.
Ballard, David; Scott, Alex; Burke, Broc; Morris, Jason; Gan, Connie; Hu, Jesse; Jammalamadaka, Udayabhanu; Sayood, Sena; Liang, Stephen; Maranhao, Bruno; Bertroche, J. Tyler; Shomer, Nirah; Woodard, Pamela; Meacham, Kathleen; and et al, ,"Protection levels of N95-level respirator substitutes proposed during the COVID-19 pandemic: Safety concerns and quantitative evaluation procedures." BMJ Open. 11,9. . (2021).