Text and Data Mining valid from 2018-09-04
Received: 16 May 2018
Accepted: 29 August 2018
First Online: 4 September 2018
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: 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 West China Hospital of Sichuan University ethics committee can offer exempt ethical statement in support.
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