Received: 14 February 2021
Accepted: 21 June 2021
First Online: 30 June 2021
: All procedures conducted in this study involving human participants complied with the ethical standards of the Handbook for Good Clinical Research Practice of the World Health Organization and the Declaration of Helsinki principles (ExternalRef removed). The experimental protocol was established, according to the ethical guidelines of the Helsinki Declaration and was approved by the Institutional Review Board (IRB) of Peking Union Medical College Hospital (PUMCH), China. Written informed consent was obtained from all subjects.
: Not applicable.
: The authors declare that they have no competing interests.