Funding for this research was provided by:
CAMS Innovation Fund for Medical Sciences (No.2016-I2M-1-001)
Tsinghua University-Peking Union Medical College Hospital Cooperation Project (PTQH201904552)
Received: 17 July 2020
Accepted: 5 October 2020
First Online: 9 October 2020
Ethics approval and consent to participate
: All procedures involving human participants were performed in accordance with the ethical standards of the Institutional Ethics Committee of Peking Union Medical College Hospital at the Chinese Academy of Medical Sciences & Peking Union Medical College (ID: S-K1110) and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. Given it was a retrospective study, written informed consent was waived.
: Not applicable.
: The authors disclose no conflicts.