1. Department of Psychology, Neuroscience and Behaviour McMaster University Hamilton Ontario Canada
2. Peter Boris Centre for Addictions Research St. Joseph's Healthcare Hamilton Hamilton Ontario Canada
3. Department of Psychiatry and Behavioural Neurosciences McMaster University Hamilton Ontario Canada
4. Department of Psychology University of Georgia Athens Georgia USA
5. Cofrin Logan Center for Addiction Research and Treatment University of Kansas Lawrence Kansas USA
6. Department of Applied Behavioral Science University of Kansas Lawrence Kansas USA