Funding for this research was provided by:
National Natural Science Foundation of China (No: 30973440, 30770950)
Natural Science Foundation of Chongqing (CSTC, 2008BA0021, cstc2012jjA0155)
Text and Data Mining valid from 2019-11-27
Received: 3 September 2019
Accepted: 5 November 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of Chongqing Medical University, and was performed in accordance with the Helsinki Declaration of 1975, as revised in 1983. All the patients enrolled were comprehensively informed, and written informed consent to participate in this research and publish the data were obtained.
: Not applicable.
: The authors declare that they have no competing interests.