From the school of Public Policy and Social Research, University of Californla, Los Angeles^a the Section of Oral and Maxillofacial Surgery, University of California, Los Anfeles^b, the Section of Public Health Dentistry, University of California, Los Angeles^c, the Department of Oral and Maxillofacial Surgery, Charles R. Drew University of Mediclne and Science^d, and the Department of Psychiatry, Univerity of Californla, Los Anfeles^e,