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. 2022 Oct 13;14(20):4273. doi: 10.3390/nu14204273

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Forest plot of mfERG outcomes in studies where subjects were administered either lutein or lutein plus zeaxanthin; SD, standard deviation; SMD, standardized mean difference; CI, confidence interval [23,24].