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. 2019 Jul 20;19(14):3200. doi: 10.3390/s19143200

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Action Unit 26 (AU26) and AU43 of the facial action coding system [34,35].