1. AO Research Institute Davos; Davos Switzerland
2. AO Clinical Investigation and Documentation; Davos Switzerland
3. University of Stuttgart; Stuttgart Germany
4. University Hospital of North Staffordshire; Staffordshire United Kingdom
5. Queen's Medical Centre; Nottingham United Kingdom
6. Nemours Childrens Specialty Care; Pensacola Florida
7. University Children's Hospital; Bern Switzerland