Xu, J
Jiang, Y
Wang, J
Shi, X
Liu, Q
Liu, Z
Li, Y
Scott, M J
Xiao, G
Li, S
Fan, L
Billiar, T R
Wilson, M A
Fan, J
Article History
Received: 11 August 2013
Revised: 22 February 2014
Accepted: 5 March 2014
First Online: 25 April 2014
Competing interests
: The authors declare no conflict of interest.