1. Hospital for Special Surgery, New York, New York, and Montefiore Medical Center Bronx New York
2. Hospital for Special Surgery and Weill Cornell Medicine New York New York
3. University of Sao Paulo Sao Paulo Brazil
4. University of Turin Turin Italy
5. University Hospital Padova Padova Italy
6. National and Kapodistrian University of Athens Athens Greece
7. Hospital Universitario Cruces Barakaldo País Vasco Spain
8. University of Milan Milan Italy
9. New York University Langone Medical Center New York New York
10. Maimonides Institute for Biomedical Research of Cordoba Cordoba Spain
11. CHU de Québec and Université Laval Quebec City Canada
12. Peking University First Hospital Beijing China
13. University College London London UK
14. University of Utah and Intermountain Healthcare Salt Lake City Utah
15. Rio de Janeiro State University Rio de Janeiro Brazil
16. University of Brescia Brescia Italy
17. Johns Hopkins University School of Medicine Baltimore Maryland
18. Hospital Universitario 12 de Octubre Madrid Spain
19. Hospital Clínic Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) Barcelona Catalonia Spain
20. University of Michigan Ann Arbor
21. Hokkaido University Hospital Sapporo Japan
22. University of Texas Medical Branch Galveston
23. University of North Carolina Chapel Hill
24. St Thomas’ Hospital London UK