Text and Data Mining valid from 2019-02-09
First Online: 9 February 2019
Compliance with Ethical Standards
: This study was funded by the National Postdoctoral Program for Innovative Talents of China (BX201600112).
: Yanhuan Feng, Rongshuang Huang, Janet Kavanagh, Lingzhi Li, Xiaoxi Zeng, Yi Li, and Ping Fu have no potential conflicts of interest that might be relevant to the contents of this manuscript.