1. David Geffen School of Medicine, University of California-Los Angeles, Los Angeles
2. University of Calgary, Calgary, Alberta, Canada
3. Erasmus MC, University Medical Center Rotterdam, Rotterdam, the Netherlands
4. Academic Medical Center, Amsterdam, the Netherlands
5. University of Melbourne, Melbourne, Australia
6. Grady Memorial Hospital, Emory University School of Medicine, Atlanta, Georgia
7. Hospital Vall d'Hebron, Barcelona, Spain
8. Hospital de Bellvitge, L'Hospet de Llobregat, Barcelona, Spain
9. Erlanger Hospital at the University of Tennessee, Chattanooga
10. Swedish Medical Center, Englewood, Colorado
11. Klinikum der Goethe–Universität, Frankfurt, Germany
12. University of Pittsburgh Medical Center, Pittsburgh, Pennyslvania
13. State University of New York at Buffalo, Buffalo
14. Maastricht University Medical Center, Maastricht, the Netherlands
15. Hospital Germans Trias i Pujol, Barcelona, Spain
16. Erlanger Medical Center, Chattanooga, Tennessee
17. Hospital Clinic de Barcelona, Barcelona, Spain
18. University Health Network, Toronto, Ontario, Canada
19. Florey Institute, Melbourne, Australia
20. University of Alberta, Edmonton, Alberta, Canada
21. Altair Biostatistics, St Louis Park, Minnesota
22. Philadelphia College of Osteopathic Medicine, Philadelphia, Pennyslvania