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. 2019 Feb 6;20:28. doi: 10.1186/s12931-019-0979-0

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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. 5 — Meta-regressions plots. Gestational age (GA) – response relationships for the incidence of bronchopulmonary dysplasia (Panel a; the lower the gestational age, the lower the odds) and the need for surfactant retreatment (Panel b; the higher the gestational age, the lower the odds) are shown. Gestational age is expressed in weeks