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. 2021 Oct 20;12(11):1274. doi: 10.3390/mi12111274

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© 2021 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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DIP, PIP, and MCP flexion of fingers and thumb: (a) all joints are extended, joint angles: 0°; (b–d) intermediate joint positions; and (e) all joints are at flexed.