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. 2017 May 29;21:123. doi: 10.1186/s13054-017-1710-5

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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. 5 — Upper panel: incidence of pneumonia comparing the heat and moisture exchanger (HME) and the heated humidifier (HH) with heated wire. Weights: Branson 5.7%, Boots (1997) 9.3%, Kirton 15%, Kollef 15.7%, Lachede 22%, Lorente 12.6%, Boots (2006) 19.7%. Lower panel incidence of pneumonia comparing HME and HH with non-heated wire. Weights: Martin 7.8%, Roustan 15.5%, Dreyfuss 16.7%, Memish 37.9%, Diaz 11.8%, Oguz 10.2%