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. 2018 Jul 6;8:10234. doi: 10.1038/s41598-018-28474-y

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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ROC curves of gray scale ultrasound, RTE, combined evaluation, and SR. Areas under the ROC curve for gray-scale ultrasound, RTE, combined evaluation and SR were 0.871, 0.916, 0.963 and 0.906 respectively. The diagnostic power of the combined evaluation was better than that of gray-scale ultrasonography (Z = 3.604, P < 0.01) and RTE (Z = 2.008, P = 0.045). The diagnostic power of gray-scale ultrasound was not significantly different compared with that of RTE (Z = 1.162, P = 0.245). The combined evaluation had better diagnostic power than that of strain ratio, but there was no significant difference (Z = 1.642, P = 0.1006).