Funding for this research was provided by:
the National Science Foundation of China (81570489)
Text and Data Mining valid from 2018-06-28
Received: 12 October 2017
Accepted: 3 May 2018
First Online: 28 June 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 General Hospital of Tianjin Medical University medical ethics committee can offer exempt ethical statement in support.
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