Liu, Jiang
Wang, Xiao-ping
Cho, Soochin
Lim, Burton K.
Irwin, David M.
Ryder, Oliver A.
Zhang, Ya-ping
Yu, Li
Article History
Received: 2 January 2014
Accepted: 30 April 2014
First Online: 27 May 2014
Competing interests
: The authors declare no competing financial interests.