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. 2019 Nov 22;16(23):4658. doi: 10.3390/ijerph16234658

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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y	0	$f_{00}$	$f_{01}$
y	1	$f_{10}$	$f_{11}$