1. Boston Combined Residency Program in Pediatrics (Boston Children’s Hospital/Boston Medical Center), Boston, Massachusetts;
2. Department of Pediatrics, Boston University School of Medicine, Boston, Massachusetts;
3. Department of Pediatrics, Drexel University College of Medicine/St Christopher's Hospital for Children, Philadelphia, Pennsylvania;
4. Department of Pediatrics, Benioff Children's Hospital/University of California, San Francisco, San Francisco, California;
5. Departments of Pediatrics and Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin;
6. Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio; and
7. Department of Pediatrics, The Medical University of South Carolina, Charleston, South Carolina; and
8. Department of Pediatrics, Harvard Medical School, Boston, Massachusetts