1. University of Rochester School of Medicine and Dentistry, Rochester, New York
2. Rochester General Hospital, Rochester, New York
3. University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
4. Baylor College of Medicine, Houston, Texas
5. University of Colorado Aschutz School of Medicine, Aurora, Colorado
6. University of Cologne Faculty of Medicine, Cologne, Germany
7. Oregon Health and Science University, Portland, Oregon
8. University of Basel, Basel, Switzerland
9. Hospital Clinico San Carlos, Madrid, Spain
10. Erasmus University Hospital, Brussels, Belgium
11. Baylor University Medical Center, Dallas, Texas
12. Tallaght University Hospital, Dublin, Ireland
13. EpiCura Hospital, Ath, Belgium
14. Erasmus Medical Center, Rotterdam, The Netherlands
15. University of Toronto, Toronto, Ontario, Canada
16. Tufts University School of Medicine, Boston, Massachusetts
17. University of Florence School of Medicine, Florence, Italy
18. University of Virginia School of Medicine, Charlottesville, Virginia
19. RCSI School of Medicine, Dublin, Ireland
20. G eorgetown University Medical Center, Washington, DC