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. 2021 Jun 2;12(6):652. doi: 10.3390/mi12060652

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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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(a) Scheme of the PD/LED yarn system for heart rate detection and picture of the comparison between the e-yarn system and a commercial one. (b) Schematic representation of a textile-based sensor with two photodiode strips, two LED strips, and a bus bar strip, for near-infrared spectroscopy. (c) Picture of a photodynamic therapy session by using a POF-based light-emitting textile at 635 nm. (d) Carnival costume integrated with LEDs. (a) Reproduced under the terms of the CC BY 4.0 license [121]. (b) Reproduced with permission [120]. Copyright 2013, The Optical Society. (c) Reproduced under the terms of the CC BY 4.0 license [137]. (d) Reproduced under the terms of the CC BY 4.0 license [116].