1. Seattle Children's Hospital; Seattle; Washington
2. Cincinnati Children's Hospital Medical Center; Cincinnati; Ohio
3. University Children's Hospital; Ljubljana; Slovenia
4. Hospital de Niños Ricardo Gutierrez; Buenos Aires; Argentina
5. University of Liverpool, Alder Hey Children's NHS Foundation Trust; Liverpool; UK
6. The University of Hong Kong; Hong Kong
7. University of Texas Southwestern Medical Center; Dallas
8. Ann & Robert H. Lurie Children's Hospital of Chicago; Chicago; Illinois