Text and Data Mining valid from 2020-01-10
Received: 2 July 2019
Accepted: 17 December 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: Our study has been approved by the Ethics committee of The First Affiliated Hospital of Anhui Medical University.
: Consent for publication was obtained from all participants.
: The authors declare that they have no competing interests.