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Permission Statement

All journals published by Xia & He Publishing are open access. As well, all the articles are distributed under the terms of CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/, which permits all non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. The copyright on all published articles will be retained with authors unless stated otherwise. Authors grant Xia & He Publishing Inc. the sole, worldwide, and exclusive right to publish (i.e., print, publish, sell and otherwise commercially exploit), reproduce, display and store the published articles.