Text and Data Mining valid from 2019-02-16
First Online: 16 February 2019
Compliance with Ethical Standards
: Long Long, Chen Zhao, Muqimova Ozarina, Xianda Zhao, Jing Yang, and Honglei Chen have no conflicts of interest related to this article.
: This work was supported by grants from the National Undergraduate Innovation Project of China (Nos. 201710486100; 201810486098) and Public Welfare Technology Application Research of Zhejiang Province (No. 2016C33236).