1. Department of Medicine, University of Virginia, Charlottesville, Virginia;
2. Department of Medicine,
3. Department of Medicine, University of Washington, Seattle, Washington;
4. Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota;
5. Department of Radiology, and
6. Departments of Radiology, Medicine, and Biomedical Engineering, University of Iowa Carver College of Medicine, Iowa City, Iowa; and
7. Department of Epidemiology, Mailman School of Public Health, Columbia University Irving Medical Center, New York, New York;
8. Department of Medicine, Weill Cornell Medical Center, New York, New York