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. 2021 Dec 23;33(1):3. doi: 10.1007/s10856-021-06626-3

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© The Author(s) 2021

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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Fig. 2 — Number of publications in the last 20 years containing the keywords “bioactive glasses” or “bioglass” and the corresponding ions. The criteria used for the search considered that the keywords should appear on the title of the publication and//or the abstract. Data obtained from the database Scopus (www.scopus.com) and Web of Science (www.webofscience.com)