Funding for this research was provided by:
National Natural Science Foundation of China (31271577)
Natural Science Foundation of Hunan Province (2014FJ6005)
Text and Data Mining valid from 2019-08-23
Received: 20 February 2019
Accepted: 13 August 2019
First Online: 23 August 2019
Ethics approval and consent to participate
: Written informed consent was obtained from all patients and this study was approved by the Ethics Review Board of Zhuzhou Central Hospital.
: Not applicable.
: The authors declare that they have no competing interests.