Funding for this research was provided by:
Natural Science Foundation of Jiangsu Province (BK20151338)
Science Fund of Jiangsu University (08JDG001)
Priority Academic Program Development of Jiangsu Higher Education Institutions
Text and Data Mining valid from 2019-01-15
Received: 20 September 2018
Accepted: 7 January 2019
First Online: 15 January 2019
Compliance with Ethical Standards
: Guan-Hua Chen declares that he has no conflict of interest. Shang-Hong Song declares that she has no conflict of interest. Zhi-Fei Gao declares that he has no conflict of interest. Xin Guo declares that she has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.