Liu, Yufei
Gao, Liyun
Yan, Huijuan
Shangguan, Jingfang
Zhang, Zhen
Xiang, Xia
Funding for this research was provided by:
National Natural Science Foundation of China (21505114)
National Natural Science Foundation of China (31601438)
Article History
Received: 6 November 2017
Accepted: 31 December 2017
First Online: 16 January 2018
Compliance with ethical standards
: The author(s) declare that they have no competing interests.