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. 2017 Sep 18;34(12):2532–2540. doi: 10.1007/s11095-017-2251-y

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© The Author(s) 2017

Open Access This 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.

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Fig. 4 — Comparison of permeability measured using in vitro and ex vivo methods. The relationship between absorption half-life in the IPL (t_{½ abs IPL}) and permeability in airway epithelial cell layers (logarithm P_app; cm/s). Formoterol has been excluded from the correlation.