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Articles published from Volume 12, Issue 3 (September 2026) onwards are licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0). This licence permits unrestricted use, distribution and reproduction in any medium, including commercial use, provided the original work is properly cited.
Articles published from Volume 1, Issue 1 (2015) to Volume 12, Issue 2 (June 2026) are licensed under the Creative Commons Attribution-NonCommercial (CC BY-NC) licence, as stated on each article.
Authors retain copyright of their articles.