Funding for this research was provided by:
National Natural Science Foundation of China (81500959, 81000605, 81071140)
International (region) Coorperation and communication (81110108007)
Text and Data Mining valid from 2018-06-26
Received: 5 April 2018
Accepted: 15 June 2018
First Online: 26 June 2018
Ethics approval and consent to participate
: The study protocol was approved by the Local Ethics Committee of West China Hospital, Sichuan University. Written informed consent was obtained from all the subjects.
: Consent to publish had been obtained from all the subjects.
: The authors declare that they have no competing interests.
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