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. 2020 Jan 11;9(1):200. doi: 10.3390/jcm9010200

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© 2020 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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Meta-regression analyses. (Panel A): impact of aspiration flow on nNO in CRSwNP patients and healthy controls; (Panel B): impact of aspiration flow on nNO in CRSwNP and CRSsNP patients; (Panel C): impact of Lund–Mackay CT score in CRSsNP patients and healthy controls; (Panel D): impact of male gender on nNO in CRSwNP and CRSsNP patients. nNO: nasal nitric oxide; CRSwNP: chronic rhinosinusitis with nasal polyps; CRSsNP: chronic rhinosinusitis without nasal polyps; CT: computed tomography.