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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 (http://creativecommons.org/licenses/by/4.0/).
(a) E4 wristband; (b) BioHarness electrode placement on chest; (c) Airbeam module; (d) SensorTag; (e) HET chest electrode placement; (f) HET chest patch and wristband; and (g) HET chest patch and wristband as worn on the body.