Funding for this research was provided by:
Non-Profit Central Research Institute Fund of Chinese Academy of Medical Sciences (2018PT32029)
Received: 18 March 2020
Accepted: 29 July 2020
First Online: 5 August 2020
Ethics approval and consent to participate
: The study was in compliance with the tenets of the Declaration of Helsinki. The Ethics Committee of Peking Union Medical College Hospital approved the study protocol. All participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.