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Authors
Tian, Zhiqiang
Wang, Yanjun
Zheng, Jianzhong
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Article History
Received: 12 January 2020
Accepted: 3 April 2020
First Online: 11 April 2020
Compliance with ethical standards
: The study was reviewed by the Ethics Committee of Shanxi Medical University. Parent and child consent forms were signed.
: The authors declare that they have no conflict of interest.
