1Mallinckrodt Institute of Radiology, Washington University in St. Louis, 510 S Kingshighway Blvd, St. Louis, MO 63110.
2Mayo Clinic, Rochester, MN
3Department of Radiology, The Perelman School of Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA.
4Department of Diagnostic Imaging, Rhode Island Hospital, Brown University, Providence, RI
5University of Kentucky, Lexington, KY
6Department of Radiology, Stanford University, Stanford, CA