Funding for this research was provided by:
Suzhou Health Talents Training Project (GSWS2019002)
Received: 4 November 2020
Accepted: 20 April 2021
First Online: 1 June 2021
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Institutional Review Board of the First Affiliated Hospital of Soochow University. As this article is a retrospective study, ethics committees have been granted exemption of patient informed consent.
: Not applicable.
: The authors declare that they have no competing interests.