Funding for this research was provided by:
Beijing Municipal Science and Technology Commission Program (D171100006517002)
Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences (2019PT320009)
Article History
Received: 11 August 2020
Accepted: 31 January 2021
First Online: 9 February 2021
Ethics approval and consent to participate
: Approval was obtained from the Institutional Review Board of Peking Union Medical College Hospital. The procedures used in this study adhere to the tenets of the Declaration of Helsinki. Informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.