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. 2020 Aug 6;31(6):943–952. doi: 10.1038/s41370-020-0258-7

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© The Author(s), under exclusive licence to Springer Nature America, Inc. 2020

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 6 — Points are colored based on filtration efficiency, and no correlation was observed between impedance and filtration efficiency (see Fig. S7a).