1. University of Illinois at Chicago College of Medicine, Chicago, Illinois, USA
2. Florida State University College of Medicine, Pensacola, Florida, USA
3. Stanford School of Medicine, Stanford, California, USA
4. University of Minnesota, Minneapolis, Minnesota, USA
5. Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
6. Texas Scottish Rite Hospital for Children, Dallas, Texas, USA
7. Hospital for Special Surgery, New York, New York, USA
8. Boston Children’s Hospital, Boston, Massachusetts, USA