Funding for this research was provided by:
Wu Jieping Medical Foundation (320.6750.18175)
Received: 13 March 2020
Accepted: 31 May 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: Ethical approval has been obtained from the institutional review board of Peking Union Medical College Hospital (reference number: ZS-1654). Written informed consent will be sought from the participants before the start of the recruitment.
: Not applicable.
: The authors declare that they have no competing interests.