1. NIAMS/ National Institutes of Health Bethesda, MD USA
2. Hospital de Santa Maria – CHLN Lisbon, Portugal
3. University of Oxford Oxford, United Kingdom
4. University of South Florida Tampa, FL USA
5. University of Toronto, Medicine Toronto, ON Canda
6. Cleveland Clinic Cleveland, OH USA
7. St Joseph’s Hospital Hamilton, ON Canada
8. University of Utah Salt Lake City, UT USA
9. Henry Ford Health System Detroit, MI USA
10. University of Pennsylvania Philadelphia, PA USA
11. Boston University Medical Center Boston, MA USA
12. University of Pittsburgh Pittsburgh, PA USA
13. Mt Sinai Hospital Toronto, ON Canada
14. Georgetown University Hospital Washington, DC USA
15. Bristol Royal Infirmary UHBristol NHS Trust Bristol, United Kingdom
16. Johns Hopkins University Baltimore, MD USA
17. Auckland District Health Board Auckland, New Zealand
18. Mayo Clinic Rochester, MN USA
19. University of East Anglia Norwich, United Kingdom