Martínez, E
Yoshihara, K
Kim, H
Mills, G M
Treviño, V
Verhaak, R G W
Article History
Received: 25 March 2014
Revised: 23 May 2014
Accepted: 15 June 2014
First Online: 4 August 2014
Competing interests
: The authors declare that they have no conflicts of interest.