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Authors
Li, Shangshan
Mu, Dali
Liu, Chunjun
Xin, Minqiang
Fu, Su
Xu, Boyang
Li, Zifei
Qi, Jun
Luan, Jie https://orcid.org/0000-0002-8927-2648
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Article History
Received: 30 January 2019
Accepted: 12 May 2019
First Online: 28 May 2019
Compliance with Ethical Standards
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: The authors declare that they have no conflicts of interest to disclose. No funding was aided for this study.
: All analyses were based on previous published studies thus ethical approval is unnecessary.
: This study was based on previous published studies that informed consent was unnecessary.
