Funding for this research was provided by:
National Natural Science Foundation of China (81401427)
Text and Data Mining valid from 2020-03-11
Received: 1 July 2019
Accepted: 3 March 2020
First Online: 11 March 2020
Ethics approval and consent to participate
: This study was approved by the institutional research ethics committee of the First Affiliated Hospital of Nanjing Medical University.
: Not applicable as only completely de-identified retrospective database from which only aggregate results were reported.
: The authors declare that they have no competing interests.