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. 2019 Feb 27;16(5):710. doi: 10.3390/ijerph16050710

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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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Percentages of review articles’ results categorized into each thematic category. Note: Group percentages do not sum to 100% as articles included in the review could reference more than one thematic category.