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. 2017 Aug 14;43:71. doi: 10.1186/s13052-017-0390-8

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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. 4 — Frequency of treatment with high flow nasal cannula (HFNC) ventilation among preterms in the three RSV epidemic seasons (2014–2015, 2015–2016 and 2016–2017). a Whole preterm population. b The 29- < 33 wGA subgroup. c The 33- < 36 wGA subgroup