1. Hospital for Sick Children; Toronto; ON; Canada
2. Freeman Hospital; Newcastle-Upon-Tyne; UK
3. Children's Healthcare of Atlanta; Atlanta; GA; USA
4. University of Alabama at Birmingham; Birmingham; AL; USA
5. Ann & Robert Lurie Children's Hospital; Chicago; IL; USA
6. Children's Hospital Colorado; Denver; CO; USA
7. Boston Children's Hospital; Boston; MA; USA
8. Children's Medical Center; Dallas; TX; USA