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. 2020 Jun 16;36(10):2471–2480. doi: 10.1007/s00381-020-04728-x

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Box-plots showing change of tumor volume (a), changes of pure-tone average (PTA) (b), and of speech discrimination score (SDS) (c) between two measurement points in the treatment and the non-treatment periods, as well as in the period before surgery. For each parameter, the data sets in the three periods did not differ significantly from each other but a trend of slower growth and change of SDS in treatment periods was seen. Preop, preoperative; Postop, postoperative. This data was illustrated and published in the original work of Gugel et al. [26]