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. 2015 Aug 5;15(8):19069–19101. doi: 10.3390/s150819069

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© 2015 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/4.0/).

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Variations in RA values and average frequency (a) Ohtsu and Tomoda (Reproduced and modified from [156]) and (b) (Reproduced and modified from Kawasaki et al. [153]).