Zhao, Xintong
Liu, Yuehua
Zhang, Xin
Bärnighausen, Till
Chen, Simiao
Funding for this research was provided by:
the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (21XNF021)
Article History
Received: 17 March 2021
Accepted: 26 November 2021
First Online: 29 April 2022
Declarations
:
: The protocol used in this study was approved by the Institutional Review Board of Renmin University of China (IRB number: SLHR20210001). All methods were performed in accordance with the relevant guidelines and regulations (Declaration of Helsinki). The current study involved all the secondary data obtained from medical records, and the requirement of the informed consent for this study has been waived by the Institutional Review Board of Renmin University of China.
: Not applicable.
: The authors declare that they have no competing interests.