Funding for this research was provided by:
National Natural Scientific Foundation of China (31100643, 31570907, 81300301, 81572306, 81502403, XJZT12Z03)
Received: 2 August 2017
Accepted: 29 January 2018
First Online: 6 February 2018
: Not further applicable.
: This study was approved by the Ethics Committee of Xijing Hospital, and written informed consent was obtained from the patients in our center.
: Not applicable.
: The authors declare that they have no competing interests.
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