Funding for this research was provided by:
National Natural Science Foundation of China (81772369)
Beijing Nova Program (Z171100001117110)
CAMS Innovation Fund for Medical Sciences (CIFMS, 2017-I2M-3-001)
Text and Data Mining valid from 2019-12-01
Received: 5 February 2019
Accepted: 20 December 2019
First Online: 23 December 2019
Ethics approval and consent to participate
: Not applicable.
: All authors agree to the publication of this manuscript.
: The authors declare that they have no competing interests.