Funding for this research was provided by:
National Natural Science Foundation of China (81570195)
Natural Science Foundation of Beijing Municipality (7182128)
Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences (2019-RC-HL-001)
Received: 18 August 2020
Accepted: 13 December 2020
First Online: 28 January 2021
Compliance with Ethical Standards
: The authors declare that they do not have a conflict of interest.
: The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.