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. 2022 Mar 31;10(4):659. doi: 10.3390/healthcare10040659

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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(a) The 51 key points inspired in the 68-point model proposed by Matthews and Baker [23]. (b–d) Facial distances to compute spatial relations between facial landmarks [16].