1Department of Psychology, University College of North Wales, Bangor, Wales, U.K., and UCB (Pharma) Ltd., Hertfordshire, U.K.; San Diego, California
2G. H. Besselaar Associates, Princeton, New Jersey; San Diego, California
3Child Guidance Clinic, San Diego Children's Hospital, San Diego, California; 4Department of Child Health and Development, George Washington University School of Medicine and Health Sciences, and Children's Hospital National Medical Center, Washington, D.C.; San Diego, California
5College of Human Development, The Pennsylvania State University, University Park, Pennsylvania; San Diego, California
6Washburn Child Guidance Center, Minneapolis, Minnesota; San Diego, California
7Department of Neuropsychology, College of Physicians and Surgeons of Columbia University, New York, New York; San Diego, California
8New York State Psychiatric Institute, New York, New York; San Diego, California
9Park-Nicollet Medical Center, Minneapolis, Minnesota; San Diego, California
10Department of Psychology, Southern Illinois University, Illinois, and Laboratory of Behavioral Medicine, Children's Hospital National Medical Center, Washington, D.C.; San Diego, California
11Department of Psychiatry, University of California, San Diego, and Child Guidance Clinic, Children's Hospital and Health Center, San Diego, California
