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Authors
Huang, Feng https://orcid.org/0000-0002-3269-7530
Luo, Zu-chun
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First Online: 10 September 2018
Compliance with Ethical Standards
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: Ethical approval was not applicable for this systematic review and meta-analysis.
: Feng Huang and Zu-chun Luo declare that they have no competing interests.
: No external funding was used in the preparation of this manuscript. This research was supported by the National Natural Science Foundation of China (nos. 81560046, 81760057) and Guangxi Natural Science Foundation (no. 2016GXNSFAA380002).
