Funding for this research was provided by:
The CAMS Innovation Fund for Medical Sciences (2016-12M-1-002)
The National Key Research and Development Program of China (2016YFC0901503)
The Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences (2019-RC-HL-001)
Received: 12 March 2020
Accepted: 15 September 2020
First Online: 23 September 2020
Ethics approval and consent to participate
: The study was performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. The study obtained waivers of informed consent and approval from the Peking Union Medical College Hospital Ethics Committee.
: Not applicable.
: The authors declare that they have no competing interests.