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Open access

All Xia & He journals are open access, and all articles are distributed under the terms of the CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/). Under this license, anyone may copy, distribute, or reuse these articles for non-commercial purposes, provided the original work is properly cited. Manuscripts submitted for publication in an open access journal are subject to the same rigorous peer-review and quality control as in scholarly subscription journals.