Tang, Yan http://orcid.org/0000-0003-4086-0040
Funding for this research was provided by:
the National Science Foundation of China (11471059)
the Science and Technology Research Project of Chongqing Municipal Education Commission (KJ1706154)
Article History
Received: 6 February 2018
Accepted: 9 September 2018
First Online: 21 September 2018
Competing interests
: The author declares that they have no competing interests.