Funding for this research was provided by:
the Priority Academic Program Development of Jiangsu Higher Education Institutions
the NSF of the Jiangsu Higher Education Institutions (17KJA110002)
Qing Lan Projects of Jiangsu Province
Qing Lan Projects of Nanjing Normarl University.
the Natural Science Foundation of Jiangsu Province (BK20181381)
Text and Data Mining valid from 2018-11-17
Received: 12 July 2018
Accepted: 5 November 2018
First Online: 17 November 2018
: The author declares that they have no competing interests.