1. Department of Radiology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Mailbox 3252, Madison, WI 53792.
2. Department of Radiology, University of Washington School of Medicine, Seattle, WA.
3. Institute of Translational Health Sciences, University of Washington, Seattle, WA.
4. Paul G. Allen School of Computer Science & Engineering, University of Washington, Seattle, WA.
5. Department of Radiology, Mayo Clinic, Rochester, MN.