From NIMH, Bethesda, Md.; Psychiatry Department, Children's Health Council, Palo Alto, Calif.; Child Development Center, University of California, Irvine; Department of Psychiatry, Ohio State University, Columbus; Department of Psychiatry, McGill University, Montreal; Department of Child and Adolescent Psychiatry, New York University; Department of Psychiatry, University of Pittsburgh, Pittsburgh; Family Studies Clinic, Duke University Medical Center, Durham, N.C.; REACH Institute, New York; Research Unit of Pediatric Psychopharmacology, Columbia University and New York State Psychiatric Institute, New York; Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, Bethesda, Md.; Center for Health Statistics, University of Illinois at Chicago; and Center for Health Statistics, University of Chicago.