Received: 4 May 2020
Accepted: 2 January 2021
First Online: 2 March 2021
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of The First Affiliated Hospital of Chongqing Medical University. All data and information of patients were used for research only and followed the principle of privacy. The consent to participants was waived due to the retrospective design.
: Not applicable.
: All authors declare that they have no competing interests.