Funding for this research was provided by:
National Natural Science Foundation of China (61402147, 61501406, 61402001)
Research Program for Top-notch Young Talents in Higher Education Institutions of Hebei Province, China (BJ2017037)
Natural Science Foundation of Hebei Province of China (F2017402068)
Research and Development Program for Science and Technology of Handan, China (1621203037)
Text and Data Mining valid from 2018-03-13
Received: 22 September 2017
Accepted: 22 February 2018
First Online: 13 March 2018
: The authors declare that they have no competing interests.
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