1. Department of Pediatrics, University of Massachusetts, Worcester, Massachusetts
2. Divisions of General and Developmental-Behavioral Pediatrics, Department of Pediatrics, University of California, Los Angeles, Los Angeles, California
3. Ambulatory Health Services, Philadelphia Department of Public Health, Philadelphia, Pennsylvania
4. Departments of Pediatrics and Psychiatry, Boonshoft School of Medicine, Wright State University, Dayton, Ohio