Funding for this research was provided by:
National Natural Science Foundation of China (81770351)
the Hubei Chenguang Talented Youth Development Foundation (0106540056)
Text and Data Mining valid from 2019-11-19
Received: 27 February 2019
Accepted: 31 October 2019
First Online: 19 November 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.