Liu, G
Yu, F-X
Kim, Y C
Meng, Z
Naipauer, J
Looney, D J
Liu, X
Gutkind, J S
Mesri, E A
Guan, K-L
Article History
Received: 24 February 2014
Revised: 18 July 2014
Accepted: 23 July 2014
First Online: 8 September 2014
Competing interests
: The authors declare no conflict of interest.