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CE is an open-access journal distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided that the original work is properly cited. It is not necessary to request permission from the publisher to use the tables or figures of articles published in CE in other journals or books for scholarly and educational purposes.