Funding for this research was provided by:
Natural Science Foundation of Hunan Province (2018JJ3500)
Research Foundation for PhD of Xiangtan University (KZ08042)
National Science and Technology Major Project (2016ZX05040-002)
Article History
Received: 2 August 2018
Accepted: 30 January 2019
First Online: 4 February 2019
Compliance with ethical standards
:
: There are no conflicts to declare.