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. 2021 Mar 10;9(3):e21331. doi: 10.2196/21331

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©Alberto Tena, Francec Claria, Francesc Solsona, Einar Meister, Monica Povedano. Originally published in JMIR Medical Informatics (http://medinform.jmir.org), 10.03.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Medical Informatics, is properly cited. The complete bibliographic information, a link to the original publication on http://medinform.jmir.org/, as well as this copyright and license information must be included.

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Principal component analysis biplot chart representing the variance of the first (Dim1) and second (Dim2) principal components in the control group (C), patients with amyotrophic lateral sclerosis (ALS) without bulbar involvement (NB), and patients with ALS with bulbar involvement (B). HNR: harmonics-to-noise ratio.