Funding for this research was provided by:
the CAMS Innovation Fund for Medical Sciences (2016-I2M-1-004)
National Key R&D Program of China (2018YFA0108600)
Text and Data Mining valid from 2019-12-01
Received: 10 May 2019
Accepted: 19 December 2019
First Online: 29 December 2019
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.