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. 2017 Jun 30;7:4429. doi: 10.1038/s41598-017-04131-8

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© The Author(s) 2017

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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Nakagami parameters corresponding to different DMD stages. Data are expressed using box plots. The Nakagami parameter increases with the DMD stage, indicating that the backscattered statistics gradually change from a pre-Rayleigh distribution to a Rayleigh distribution. (a) Rectus femoris; (b) tibialis anterior; (c) gastrocnemius. (d–f) Corresponding ROC curves. The AUROC for the Nakagami parameter of the gastrocnemius muscle (0.89) is higher than those of the rectus femoris and tibialis anterior muscles.