Wu, Jiamin
Xiong, Bo
Lin, Xing
He, Jijun
Suo, Jinli
Dai, Qionghai
Article History
Received: 18 December 2015
Accepted: 4 April 2016
First Online: 22 April 2016
Competing interests
: J.W., X.L., J.H. and Q.D. are named inventors on a number of related patent applications. B.X. and J.S. declare no potential coflict of interest.