AUTHORS 
Steven E. Hyman, M.D. 
Assistant Professor of Psychiatry 
Director 
Divisions on Addiction 
Tuon Van Nguyen, M.D., Ph.D. 
Research Fellow in Psychiatry 
Molecular Neurobiology Laboratory 
Massachusetts General Hospital 
Department of Psychiatry 
Harvard Medical School 
Boston, MA 02115 
Barry E. Kosofsky, M.D., Ph.D. 
Instructor in Neurology 
Michael J. Comb, Ph.D. 
Assistant Professor of Neurology 
Molecular Neurobiology Laboratory 
Massachusetts General Hospital 
Department of Neurology 
Harvard Medical School 
Boston, MA 02115 
Bruce M. Cohen, M.D., Ph.D. 
Associate Professor of Psychiatry 
Department of Psychiatry 
Harvard Medical School 
Boston, MA 02115 
Associate General Director 
Mailman Laboratories 
McLean Hospital 
Belmont, MA 02138 
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