Qi, Yantao
Chai, Jixin
Zhang, Liuyang
Chen, Yong
Funding for this research was provided by:
S&T Program of Chengde (202109A052, 202109A052, 202109A052, 202109A052)
Article History
Received: 12 June 2022
Accepted: 11 November 2022
First Online: 22 December 2022
Declarations
:
: This study has been reviewed and approved by the Ethical Committee of The Affiliated Hospital of Chengde Medical University. All procedures involving human participants were performed in accordance with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. Because this was a retrospective study, informed consent was not required by the Ethical Committee of The Affiliated Hospital of Chengde Medical University.
: Not applicable.
: The authors declare that they have no competing interests.