Text and Data Mining valid from 2019-01-02
First Online: 2 January 2019
Compliance with Ethical Standards
: Lechun Lyu, Yu Zhao, Hongquan Lu, Zijie Liu, Jiazhi Guo, Di Lu, and Xiang Li have no conflicts of interest.
: The authors are supported by grants from the National Natural Science Foundation of China (NSFC; Grant no. 81560502), the National Natural Science Foundation of Yunnan Province (Grant no. 2017FB116), the Talent Project of Yunnan Province (Lechun Lyu) and 100 Talents Program of Kunming Medical University (Lechun Lyu).