Funding for this research was provided by:
Zhejiang medical and health science and technology project (2021KY001)
Received: 22 April 2021
Accepted: 21 July 2021
First Online: 3 August 2021
: The ethics committees of each of the five hospitals approved this study, and patient informed consent was waived due to the retrospective nature of the study.
: Not applicable.
: All the authors have no conflict of interest.