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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 (https://creativecommons.org/licenses/by/4.0/).
SSQ score comparison in accordance with age. (a–d) show the SSQ scores , , , and of the rest state, , and , respectively. ** and *** represent that p-value is less than 0.01 and 0.001, respectively.