Funding for this research was provided by:
National Natural Science Foundation of China (81500809)
Text and Data Mining valid from 2019-07-29
Received: 15 January 2019
Revised: 3 July 2019
Accepted: 15 July 2019
First Online: 29 July 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Affiliated Hospital of Nantong University.
: Not applicable.
: The authors declare that they have no competing interests.