1. From the Children's Hospital, San Diego and
2. Department of Pediatrics, University of California, San Diego, San Diego, California;
3. Department of Pediatrics, Harvard University School of Medicine, Boston, Massachusetts;
4. Department of Pediatrics, University of Chicago Pritzker School of Medicine and
5. University of Chicago, Children's Hospital, Chicago, Illinois;
6. Howard University College of Medicine, Washington, DC;
7. Maine General Hospital, Augusta, Maine; and
8. Maine Medical Assessment Foundation, Manchester, Maine.