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. 2020 Apr 1;10:5768. doi: 10.1038/s41598-020-62647-y

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Comparison of longitudinal change in speech evaluation scores between the ML and SGN groups. The speech perception scores were seemingly higher in the ML group than in the SGN group at postoperative 3 and 6 months, but the difference did not reach a level of significance (Mann-Whitney U-test). Nonetheless, the speech perception scores in the SGN group eventually converged with those in the ML group at 1-year evaluation. Additionally, there was no significant difference in the improvement during postoperative 1-year follow-up between ML and SGN groups.