1. Department of Medicine, Children's Hospital Boston, Harvard Medical School, Boston, Massachusetts
2. Robert Wood Johnson Foundation Clinical Scholar Program
3. Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, Pennsylvania
4. Department of General Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
5. Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
6. Children's Hospital and Health Center, University of California, San Diego, School of Medicine, San Diego, California
7. Children's National Medical Center, George Washington University School of Medicine, Washington, DC