Liang, Xin M.
Sekar, Praveen K.
Zhao, Gang
Zhou, Xiaoming
Shu, Zhiquan
Huang, Zhongping
Ding, Weiping
Zhang, Qingchuan
Gao, Dayong
Article History
Received: 30 December 2014
Accepted: 7 April 2015
First Online: 20 May 2015
Competing interests
: The authors declare no competing financial interests.