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. 2019 Sep 18;20:212. doi: 10.1186/s12931-019-1183-y

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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. 1 — Participants selection and data availability. Flowchart of participants’ selection and data availability. From the 22 centers (3415 patients) that were included in the iPCD cohort, 20 centers (2896 patients) agreed to participate and provided data to the study. Of these 163 were patients that underwent lung resection. Of the remaining 2733 patients, we randomly selected 265 controls stratified by age (± 5 years), sex and center. Data availability for cross-sectional and longitudinal case-control analysis as well as data availability for the within cases pre-post lung resection analysis is also displayed