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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/).
Barplot with the number of videos for each class (severity of UPDRS) for the papers that perform multiclass classification. References to the papers presented in the figure: Khan et al. [37], Li et al. [41], Park et al. [43], Yang et al. [44], Li et al. [45], and Guo et al. [46].