Funding for this research was provided by:
National Natural Science Foundation of China (81470577, 81270956)
Text and Data Mining valid from 2019-11-25
Received: 15 September 2019
Accepted: 7 November 2019
First Online: 25 November 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Second Xiangya Hospital of Central South University and informed consent was gained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.