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. 2019 Feb 15;19:42. doi: 10.1186/s12890-019-0807-9

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© The Author(s). 2019

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. 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. 6 — Man+Leu retention. a: Capsule b: Handihaler c: Cannula+connection tube d: Replica. Data are presented as mean ± SEM (n = 3). Statistically significant results are marked with asterisks (*). A single asterisk indicates p ≤ 0.05. Two asterisks indicate p ≤ 0.01