Song, Shangxin
Hooiveld, Guido J.
Li, Mengjie
Zhao, Fan
Zhang, Wei
Xu, Xinglian
Muller, Michael
Li, Chunbao
Zhou, Guanghong
Article History
Received: 10 August 2015
Accepted: 23 December 2015
First Online: 9 February 2016
Competing interests
: The authors declare no competing financial interests.