Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (3332018022)
National Natural Science Foundation of China (91859119)
Beijing Municipal Natural Science Foundation (7192176)
Education Reform Fund of Peking Union Medical College (10023201700104)
National Public Welfare Basic Scientific Research Project of Chinese Academy of Medical Sciences (No. 2019PT320008 and 2018PT32003)
Youth Educator Program of Peking Union Medical College (2019zlgc0705)
Text and Data Mining valid from 2019-12-01
Received: 30 April 2019
Accepted: 6 December 2019
First Online: 21 December 2019
Ethics approval and consent to participate
: Ethical approval was obtained by the local institutional review board. Informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.