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Authors
Xiao, Na
Zhang, Jun
Chen, Chao
Wan, Yanfang
Wang, Ning
Yang, Jing
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Article History
Received: 9 September 2019
Accepted: 9 October 2019
First Online: 23 October 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All participants in this study were informed and gave a written consent.
: The protocols were approved by the Ethics Committee of Cangzhou Central Hospital, and all participants signed informed consent.
