Funding for this research was provided by:
National Health and Medical Research Council (APP1107393)
Received: 28 January 2019
Accepted: 20 May 2019
First Online: 3 June 2019
Ethics approval and consent to participate
: Ethics approval for pilot study was sought from Eastern Sydney Local Health District (SESLHD). Ethics approval for the main study was sought from Human Research Ethics Committee UNSW (HC16703) and IBR China. Consent was obtained from all participants before recruitment.
: Not applicable <b>.</b>
: All authors have completed the Unified Competing Interests form (available on request from the corresponding author) and declare that: AAC had testing of filtration of masks by 3 M for PhD. CRM has held an Australian Research Council Linkage Grant with 3 M as the industry partner, for investigator driven research. 3 M have also contributed supplies of masks and respirators for investigator-driven clinical trials. She has received research grants and laboratory testing as in-kind support from Pfizer, GSK and Bio-CSL for investigator-driven research. The remaining authors declare that they have no competing interests and have no non-financial interests that may be relevant to the submitted work.