Funding for this research was provided by:
Young Scientists Fund (81702212)
Text and Data Mining valid from 2020-01-09
Received: 28 August 2019
Accepted: 2 January 2020
First Online: 9 January 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Ethics Committee of The Second Hospital of Shanxi Medical University. All patients gave their written informed consent for the study.
: Not applicable.
: The authors declare that they have no competing interests.