Yang, Jie
Swenson, Nathan G.
Zhang, Guocheng
Ci, Xiuqin
Cao, Min
Sha, Liqing
Li, Jie
Ferry Slik, J. W.
Lin, Luxiang
Article History
Received: 27 February 2015
Accepted: 7 July 2015
First Online: 3 August 2015
Competing interests
: The authors declare no competing financial interests.