Article History
Received: 4 June 2021
Accepted: 11 September 2021
First Online: 24 September 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: Ethics committee of Zibo Central Hospital has approved this study. 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.
: All participants in this study were informed and gave a written consent.