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. 2018 Jul 11;6:38. doi: 10.1186/s40560-018-0306-8

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© The Author(s). 2018

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. 1 — Diameters of the drainage and return cannulas. Box plot graph showing the diameters of a the drainage cannula and b return cannula used in 2009 and 2016. The diameters of both cannulas were significantly larger in 2016 compared with those in 2009