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. 2021 Jul 20;21(14):4937. doi: 10.3390/s21144937

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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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Validation Pyramid by mhealth Belgium, platform for CE-marked mobile health applications in Belgium [61]. Reprinted with permission from ref [61]. Copyright 2020 Agoria vzw/asbl and beMedTech vzw/asbl.