1 Department of Radiology, Boston University Medical Center, 820 Harrison Avenue, FGH-4, Boston, MA 02118 and Boston University School of Medicine, Boston, MA. Electronic address: [email protected].
2 Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, 1161 21(st) Avenue South, CCC-1118 Medical Center North, Nashville, TN 37232-2675.
3 Department of Radiology, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, F2/418 CSC, Madison, WI 53792; and.
4 Department of Radiology and Biomedical Imaging, University of California San Francisco, 505 Parnassus Avenue, Room M-391, San Francisco, CA 94143-0628.