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. 2018 Sep 6;265(11):2646–2655. doi: 10.1007/s00415-018-9037-y

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© The Author(s) 2018

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.

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Fig. 1 — a MR image of left upper leg with a region of interest drawn for a normal looking rectus femoris muscle. b The corresponding ultrasound image to a. c MR image of left upper leg with a region of interest drawn for a dystrophic rectus femoris muscle. d The corresponding ultrasound image to c. S: sartorius; G: gracilis; VM: vastus medialis; VI: vastus intermedius; VL; vastus lateralis; AL: adductor longus; AM: adductor magnus