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. 2014 Nov 14;14(11):21565–21587. doi: 10.3390/s141121565

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 8. — iTDS-2 prototypes with custom PCBs, electronics, a rechargeable Li-Ion battery, and a PIFA antenna, all hermetically sealed in the form of an arch-shaped dental retainer.