Shane W Kraus1, Valerie Voon2, Ariel Kor3, Marc N Potenza4,5. 1. VISN 1 New England MIRECC, Edith Nourse Rogers Memorial Veterans Hospital, Massachusetts, USA. 2. Department of Psychiatry, University of Cambridge, Cambridge, UK. 3. Department of Psychology, Teachers College, Columbia University, New York, USA. 4. Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut, USA. 5. Department of Neurobiology, Child Study Center, the National Center on Addiction and Substance Abuse and Connecticut Mental Health Center, Yale University School of Medicine, New Haven, Connecticut, USA.