Funding for this research was provided by:
Chongqing Science and Technology Commission (No. KJ1703052)
Natural Science Foundation of Chongqing (cstc2018jcyjA3693)
Chongqing basic science and frontier research project (cstc2017jcyjAX0179)
Text and Data Mining valid from 2020-02-12
Received: 10 July 2019
Accepted: 6 January 2020
First Online: 12 February 2020
Ethics approval and consent to participate
: This work conforms with all regulations pertaining to ethics approval and the consent to participate. In general, this is not applicable to our study, as there were no human subjects subject to research.
: Not applicable.
: The authors declare that they have no competing interests.