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. 2015 May 27;7(6):4068–4092. doi: 10.3390/nu7064068

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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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Flow chart displaying the stages used to select the references considered. EndNote X1 (Bld 2566, Thomson Reuters: New York, NY, USA, 2007). * Some references may appear in more than one section of the review.