1. Department of Medicine; Massachusetts General Hospital; Boston Massachusetts
2. Department of Health Policy and Management, Harvard T.H. Chan School of Public Health; Harvard University; Boston Massachusetts
3. Department of Internal Medicine; University of Texas Southwestern Medical Center; Dallas Texas
4. Department of Clinical Sciences; University of Texas Southwestern Medical Center; Dallas Texas
5. Office of Disease Prevention; National Institutes of Health; Bethesda Maryland
6. Department of Radiology, Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania