Funding for this research was provided by:
National Natural Science Foundation of China (81500403)
Text and Data Mining valid from 2018-08-24
Received: 1 August 2017
Accepted: 14 August 2018
First Online: 24 August 2018
Ethics approval and consent to participate
: This article is a retrospective study and does not contain any studies with human subjects performed by any of the authors. So, the ethical approval was not necessary and the First Affiliated Hospital of Anhui Medical University ethics committee can offer exempt ethical statement in support.
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