1. Pediatric Research Consortium,
2. Pediatric Generalist Research Group, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania;
3. Departments of Pediatrics and
4. Center for Biomedical Informatics, and
5. Biostatistics and Epidemiology and
6. Divisions of Health Policy and Clinical Effectiveness and Emergency Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; and
7. Leonard Davis Institute of Health Economics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania;
8. Center for Health Equity Research and Promotion, Philadelphia VA Medical Center, Philadelphia, Pennsylvania