1. Cincinnati Children's Hospital Medical Center University of Cincinnati College of Medicine Cincinnati Ohio USA
2. Lucile Packard Children's Hospital Stanford Stanford University School of Medicine Palo Alto California USA
3. Baylor College of Medicine Texas Children's Hospital Houston Texas USA
4. Johns Hopkins All Children's Hospital Saint Petersburg Florida USA
5. Harvard Medical School Boston Children's Hospital Boston Massachusetts USA
6. Perelman School of Medicine Children's Hospital of Philadelphia Philadelphia Pennsylvania USA