Funding for this research was provided by:
National Natural Science Foundation of China (81470141)
Received: 19 April 2017
Accepted: 15 January 2018
First Online: 29 January 2018
Ethics approval and consent to participate
: This cohort study was approved by the Local Ethics Committee of West China Hospital, Sichuan University.
: Written informed consent was obtained from each patient after being informed of the purpose and investigational nature of this study.
: The authors declare that they have no competing interests.
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