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. 2022 Jan 30;14(3):621. doi: 10.3390/nu14030621

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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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Quantitative analysis for Perceived Stress scale (PSS) of randomized controlled trials receiving either probiotics or placebo treatment. Chung 2014 [36], Messaoudi 2011 [52], Östlund-Lagerström 2016 [59], Patterson 2020 [60], Sanchez 2017 [68].