1. NIDA Intramural Research Program, Baltimore (all authors); National Institute on Alcohol Abuse and Alcoholism Division of Intramural Clinical and Biological Research (Leggio), and National Institute of Neurological Disorders and Stroke Intramural Research Program (Spagnolo), Bethesda, Md.;Department of Neuroscience, Imaging, and Clinical Science, University “G. d’Annunzio” of Chieti-Pescara, Chieti, Italy (Montemitro).