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. 2017 Jan 4;25:2. doi: 10.1186/s12998-016-0132-9

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© The Author(s). 2017

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 — Ultrasound image of the Rcpm at rest in transverse view at C1. The caliper is placed around the midpoint above the C1 lamina betwen the inner and outer borders of the muscle where it was considered thickest by the raters