Chen, Haijun
Tan, Guanzheng
Funding for this research was provided by:
Natural Science Foundation of Hunan Province of China (2016JJ4045)
Educational Commission of Hunan Province of China (17A114)
Article History
Received: 4 December 2017
Revised: 3 January 2018
Accepted: 16 January 2018
First Online: 12 February 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.