Funding for this research was provided by:
Peking Union Medical College (3060120043)
Article History
Received: 3 July 2021
Accepted: 12 September 2021
First Online: 28 September 2021
Declarations
:
: The authors declare that there is no conflict of interest regarding the publication of the paper.
: All procedures performed in studies involving the human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For this type of study, informed consent is not required.