1. Mayo Clinic Arizona, Department of Radiology , Phoenix, AZ , USA
2. Johns Hopkins School of Medicine, Department of Radiology , Baltimore, MD , USA
3. Fred Hutchinson Cancer Research Center, Clinical Research Division , Seattle, WA , USA
4. University of Vermont, Department of Radiology , Burlington, VT , USA
5. Singapore General Hospital, Department of Diagnostic Radiology , Singapore , Singapore
6. Emory University, Department of Radiology , Atlanta, GA USA
7. University of Washington, Department of Radiology , Seattle, WA , USA