Volkow, N D
Wang, G-J
Logan, J
Alexoff, D
Fowler, J S
Thanos, P K
Wong, C
Casado, V
Ferre, S
Tomasi, D
Article History
Received: 29 December 2014
Accepted: 10 February 2015
First Online: 14 April 2015
Competing interests
: The authors declare no conflict of interest.