Zhang, Kai http://orcid.org/0000-0003-3454-7357
Li, Nan http://orcid.org/0000-0001-7826-4688
Ainsworth, Richard I.
Wang, Wei
Article History
Received: 17 February 2016
Accepted: 15 June 2016
First Online: 27 July 2016
Competing interests
: The authors declare no competing financial interests.