Zhao, X
Parpart, S
Takai, A
Roessler, S
Budhu, A
Yu, Z
Blank, M
Zhang, Y E
Jia, H-L
Ye, Q-H
Qin, L-X
Tang, Z-Y
Thorgeirsson, S S
Wang, X W
Article History
Received: 20 May 2014
Revised: 26 November 2014
Accepted: 5 December 2014
First Online: 19 January 2015
Competing interests
: The authors declare no conflict of interest.