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. 2019 Jun 14;9:30. doi: 10.1186/s13601-019-0269-4

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — The total nasal endoscopic polyp score expressed as Davos score between 0 and 6. The total nasal endoscopic polyp score is divided in four groups and the percentage of study objects with a certain Davos score are shown at the three time points (2000 N = 47, 2006 N = 27 and 2012 N = 24). *P < 0.05; ***P < 0.001