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All Xia & He journals are open access and all articles are distributed under the terms of CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/). This permits all non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 
Copyright

Starting from January 1st 2017, the copyright on all published articles is 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.