1. National Institute on Alcohol Abuse and Alcoholism (NIAAA), Bethesda, Maryland, USA (J. W. Luk, M. F. Thompson, L. A. Novak, M. L. Schwandt, D. Goldman, N. Diazgranados); Department of Medical and Clinical Psychology, Uniformed Services University, Bethesda, Maryland, USA (M. F. Thompson, L. A. Novak); Human Psychopharmacology Laboratory, NIAAA, Bethesda, Maryland, USA (B. L. Stangl, V. A. Ramchandani); Laboratory of Neurogenetics, NIAAA, Rockville, Maryland, USA (D. Goldman)