1. Department of Medicine, Columbia University Medical Center, New York, New York
2. Department of Medicine, McGill University, Montreal, Quebec, Canada
3. Department of Physics, Ryerson University, Toronto, Ontario, Canada
4. Department of Radiology, University of Iowa, Iowa City
5. Department of Biomedical Engineering, University of Iowa, Iowa City
6. Department of Internal Medicine, University of Iowa, Iowa City
7. Department of Biostatistics, University of Washington, Seattle
8. Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
9. Department of Medicine, Northwestern University, Chicago, Illinois
10. Department of Medicine, Wake Forest University, Winston-Salem, North Carolina
11. Department of Radiology, University of British Columbia, Vancouver, Canada
12. Department of Medicine, University of California, Los Angeles
13. Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill
14. Department of Medicine, Temple University, Philadelphia, Pennsylvania
15. Department of Medicine, University of Alabama at Birmingham, Birmingham
16. Department of Medicine, University of Michigan, Ann Arbor
17. Department of Medicine, Johns Hopkins University, Baltimore, Maryland
18. Division of Epidemiology and Community Health School of Public Health, University of Minnesota, Minneapolis
19. Department of Epidemiology, University of Washington, Seattle
20. Department of Environmental and Occupational Health Sciences, University of Washington, Seattle
21. Department of Mechanical Engineering, University of Iowa, Iowa City
22. Department of Public Health Sciences, University of Virginia, Charlottesville
23. Department of Medicine, Cornell University, New York, New York
24. Department of Medicine, University of Utah, Salt Lake City
25. Department of Medicine, University of British Columbia, Vancouver, Canada
26. Department of Medicine, University of California, San Francisco