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. 2018 Oct 19;18:73. doi: 10.1186/s12902-018-0301-z

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© The Author(s). 2018

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. 2 — a Metastatic patterns of pNENs. b Survival time of patients different metastatic patterns. c Survival time of patients with single distant organ metastasis. d Kaplan-Meier curve of overall survival of patients with modified M-stage classification. e Survival time of patients with modified M-stage classification. * Significant difference: P < 0.008; ^T Tendentious difference: P < 0.017