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. 2020 Apr 10:10.1097/ALN.0000000000003332. doi: 10.1097/ALN.0000000000003332

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This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 2. — (Left) Three-dimensional rendition of flow limiters. Longitudinal and cross sectional views shown above. (Right) Commercially available one-way circuit valve.