1. Cincinnati Children's Hospital Medical Center; Cincinnati Ohio U.S.A.
2. Medical University of South Carolina; Charleston South Carolina U.S.A.
3. Children's Hospital of Orange County; Orange California U.S.A.
4. Cook Children's Health Care System; Fort Worth Texas U.S.A.
5. University of Wisconsin; Madison Wisconsin U.S.A.
6. Texas A&M University; College Station Texas U.S.A.