Funding for this research was provided by:
National Natural Science Foundation of China (31371700)
Fundamental Research Funds for the Central Universities (XDJK2018C052)
Text and Data Mining valid from 2018-12-06
Received: 4 July 2018
Accepted: 30 November 2018
First Online: 6 December 2018
Compliance with ethical standards
: The experiments comply with the current laws of the country.
: The authors declare that they have no conflict of interest.