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. 2021 May 5;11:9630. doi: 10.1038/s41598-021-88919-9

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Illustration of the 7 scripted tasks performed by PD and ET patients for each tremor assessment. (1) Rest-1; (2) Rest-2; (3) Posture-1; (4) Posture-2; (5) action tremor (repetitive finger to nose motion); (6) Load-1 (empty cup); (7) Load-2 (1-lb weight in the cup). (b) Placement of the 3-axis accelerometer sensor on the dorsum of hand. Please note that this figure is reproduced from the Figure 1 of the work by Shahtalebi et al.²⁵.