1. From the Alcoholism and Drug Addiction Research Foundation, 24 Harbord St., Toronto, and the Toronto Western Hospital, Toronto, Canada.
2. Respectively, Research Associate, Alcoholism and Drug Addiction Research Foundation; Assistant Professor, Department of Psychology, University of British Columbia; Clinical Teacher, University of Toronto, Department of Psychiatry, and Attending Psychiatrist, Toronto Western Hospital; Research Fellow, University of Toronto, Departments of Psychiatry and Medicine.