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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/).
A portable device-type system developed by Arakawa et al.: (A) developed portable device-type system (B) appearance of the system and interface that shows the current blood pressure; (C) demonstration of the operation of the system.