1 Department of Radiology, Beth Israel Deaconess Medical Center, Boston, Massachusetts. Electronic address: [email protected].
2 Department of Radiology, University of Alabama, Birmingham, Alabama.
3 Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, Tennessee, and the Veteran's Health Administration-Tennessee Valley Healthcare System Geriatric, Research Education Center, Nashville, Tennessee.
4 Department of Radiology, University of Massachusetts Memorial Medical Center-University Campus, Worcester, Massachusetts.
5 Lahey Hospital and Medical Center, Burlington, Massachusetts.
6 Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, Tennessee.