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. 2018 Feb 8;28(7):2882–2889. doi: 10.1007/s00330-017-5218-9

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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.

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Fig. 1 — Drawing of the muscles of the thigh representing the regions of interest (ROIs) used for the ratio analysis. In this example, an injured area on the right rectus femoris muscle is represented (yellow star) where a manual ROI (red ROI in a, indicated by the yellow arrow) has been drawn (ROI_tear). The same ROI has been drawn on a healthy ipsilateral area (blue ROI in a; i.e., ROI_hi). The same areas were then investigated on the contralateral side (red and blue ROIs in b, respectively ROI_{hc_t} and ROI_{hc_i})