Funding for this research was provided by:
hospital training funding (PYJJ2019-08)
the medical senior talents programme of Chongqing (2019GDRC001)
Received: 24 October 2020
Accepted: 11 January 2021
First Online: 21 January 2021
Ethics approval and consent to participate
: The Institutional Review Board of the First Affiliated Hospital of Chongqing Medical University approved this study and conducted in accordance with the Declaration of Helsinki. All participants provided written informed consent before their data were stored in our hospital database and used for study purposes.
: Not applicable.
: The authors declare that they have no competing interests.