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. 2023 Apr 15;33(3):439–447. doi: 10.1038/s41370-023-00543-z

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Fig. 2 — Results presented for 2439 respondents with a venting device and 1056 with a recirculating device. The ventilation challenges are categorized by the level of removal achieved: all is removed (blue), most is removed (green), some is removed (yellow), and none is removed (red).