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. 2019 May 31;17:91. doi: 10.1186/s12957-019-1638-0

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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. 2 — Comparison of receiver operating curves (ROC) for the presence of multifocal or bilateral tumors or tumor size above 0.5 cm. The performance of a marker unable to discriminate between pN0 and pN1 patients, whose area under the ROC curve (AUC) is equal to 0.5 was marked with a constant line