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. 2019 Aug 16;19:198. doi: 10.1186/s12872-019-1166-4

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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 — Illustration of the graphical analysis of the preterm infants in the Poincare Plot. a moment I, lower complexity of the indices (known as “torpedo”). b moment II, more dispersed patterns are related to greater complexity of the indices (known as “comet”)