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Socioeconomic status (SES) was assessed using a trichotomous index based on the following: (1) highest level of education obtained by the mother and father, (2) number of parents who worked full time, and (3) participant in a free or reduced-price lunch program at school [24].
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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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