Funding for this research was provided by:
National Natural Science Foundation of China (81371566)
Received: 6 April 2018
Accepted: 19 November 2018
First Online: 5 December 2018
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Tangdu Hospital (TDLL-2013082) 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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