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Authors
Deng, Shumin https://orcid.org/0000-0003-1679-6712
Huang, Danqin
Wang, Wei
Yan, Hong
Li, Shiyue
Xiang, Hao
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Article History
Received: 18 January 2019
Accepted: 29 May 2019
First Online: 18 June 2019
Compliance with ethical standards
: This study was conducted within an agreement of Wuhan University. All the parents recruited in the study signed informed consent letters before the survey.
: The authors declare that they have no conflict of interest.
