1. Children’s National Hospital and School of Medicine and Health Sciences, George Washington University, Washington, District of Columbia
2. Children’s Hospital Los Angeles and University of Southern California, Los Angeles, California
3. Floating Hospital for Children at Tufts Medical Center, Boston, Massachusetts
4. Advocate Children’s Hospital-Oak Lawn, Oak Lawn, Illinois
5. Department of Pediatrics, University of Chicago, Chicago, Illinois
6. Dell Children’s Medical Center of Central Texas and 10 University of Texas-Austin Medical School, Austin, Texas