1. Vanderbilt University Medical Center Nashville Tennessee USA
2. Nationwide Children’s Hospital & The Ohio State University Columbus Ohio USA
3. UPMC Children’s Hospital of Pittsburgh Pittsburgh Pennsylvania USA
4. Stanford University Palo Alto California USA
5. Hospital Guillermo Almenara Irigoyen Lima Peru
6. Cincinnati Children’s Hospital Medical Center Cincinnati Ohio USA
7. Children’s Hospital of Geneva Geneva University Hospitals and Faculty of Medicine Geneva Switzerland
8. Red Cross War Memorial Children’s Hospital University of Cape Town Cape Town South Africa
9. University of Zurich Faculty of Medicine Zurich Switzerland