Yan, Pingdan
Hao, Yixiong
Shu, Zhaoche
Gu, Chunling
Zhou, Xiaomei
Liu, Xiaoyu
Xiang, Hua
Funding for this research was provided by:
Chongqing Municipal Education Commission science and technology research project Foundation of China (KJ1400211)
Article History
Received: 5 March 2018
Accepted: 6 May 2018
First Online: 13 May 2018
Compliance with ethical standards
: The author(s) declare that they have no competing interests.