Funding for this research was provided by:
Chinese NSFC (31400999, 81872014)
Text and Data Mining valid from 2019-08-14
Received: 3 June 2019
Accepted: 1 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: This article does not contain any studies with human subjects and animals performed by any of the authors.
: The authors agree for publication.
: Jianghong Yan, Xiaoyun Dou, Jing Zhou, Yuanfeng Xiong, Ling Mo, Longhao Li and Yunlong Lei declare that they have no competing interests.