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. 2018 Mar 8;18:67. doi: 10.1186/s12877-018-0753-z

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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. 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. 1 — Masseter muscle thickness measurements. a Position of the probe during measurement. b Masseter muscle imaging with an ultrasonic diagnostic equipment. Upper edge of the tragus (B) Point under the nasal wing (C) Camper’s plane (D) Masseter muscle surface (E) Mandibular ramus (F) Masseter muscle thickness