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. 2019 May 20;12(10):1643. doi: 10.3390/ma12101643

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The carboxy hemoglobin (COHb) percentage is increasing in the direct CO inhalation beyond the therapeutic zone (~10%) during the mainstream blood circulation. (This information is based on data reported in reference [44,45]).