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. 2019 Apr 2;19:47. doi: 10.1186/s12876-019-0963-7

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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. 4 — Scree plots of UC (left) and CD (right). Eigen values denote variance accounted for by a linear combination. As can been seen in the left panel (UC) and right panel (CD), the amount of variance accounted is greatest for the first component, then the second, followed by the third and fourth, but diminishes greatly thereafter; this reveals the 4-component solution is the best