Fang, H
Liu, X
RamÃrez, J
Choudhury, N
Kubo, M
Im, H K
Konkashbaev, A
Cox, N J
Ratain, M J
Nakamura, Y
O'Donnell, P H
Article History
Received: 18 December 2013
Revised: 30 April 2014
Accepted: 22 May 2014
First Online: 1 July 2014
Competing interests
: The authors declare no conflict of interest.