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. 2017 Sep 17;7:33. doi: 10.1186/s13601-017-0169-4

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© The Author(s) 2017

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 — Reduction of PNIF during exposure with birch pollen in the GA²LEN chamber. PNIF development during exposure with Betula pendula. A hash marks a reduction compared to baseline p < 0.001, a dagger a reduction compared to baseline p < 0.01 and a double dagger a reduction compared to baseline p < 0.05. Outliers are presented as degree sign, extreme outliers as asterisk. PNIF% is displayed as medians and boxplots