Funding for this research was provided by:
Natural Science Foundation of Beijing Municipality (7172168)
Fundamental Research Funds for the Central Universities (3332018020)
Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences (2019XK320033)
Received: 8 October 2020
Accepted: 23 December 2020
First Online: 22 February 2021
Ethical approval and consent to participate
: This study was approved by the Institutional Review Board of PUMCH, China. All experimental procedures involving human participants were performed in accordance with the ethical standards of the institutional and national research committee and the Declaration of Helsinki and its later amendments. Informed consent was obtained from all individual participants included in the study.
: All authors have approved the manuscript for submission.
: The authors declare that they have no conflict of interest.