1. Children's Hospital of Michigan; Detroit Michigan
2. Division of Pediatric Cardiology; University of California San Francisco; San Francisco California
3. Advocate Children's Hospital; Oak Lawn Illinois
4. Instituto Dante Pazzanese de Cardiologia; Sao Paulo Brazil
5. University of Minnesota Amplatz Children's Hospital; Minneapolis Minnesota
6. Ann and Robert H. Lurie Children's Hospital of Chicago; Chicago Illinois
7. University Hospitals Case Medical Center; Cleveland Ohio
8. Phoenix Children's Hospital; Phoenix Arizona
9. Children's Hospital Colorado; Denver Colorado
10. Fundacion Valle de Lili; Cali Colombia
11. Arnold Palmer Hospital for Children; Orlando Florida
12. University of Iowa Children's Hospital; Iowa city Iowa