Text and Data Mining valid from 2020-02-10
Received: 9 September 2019
Accepted: 15 January 2020
First Online: 10 February 2020
Ethics approval and consent to participate
: Ethical approval was given by The Second Hospital of Anhui Medical University. All patients signed the written informed consent.
: All of the authors have consent to publish this research.
: The authors declare that they have no competing interests.