Article History
Received: 25 June 2015
Revised: 6 August 2015
Accepted: 6 September 2015
First Online: 27 October 2015
Competing interests
: KH is an inventor on a field patent application (now pending) on ‘The use of TrkB antagonists in the treatment of substance abuse’ by Chiba University. KH has served as a scientific consultant to Astellas, Dainippon-Sumitomo and Taisho, and he has also received research support from Abbvie, Dainippon-Sumitomo, Mochida, Otsuka and Taisho. The remaining authors declare no conflicts of interest.