1 Department of Radiology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, and Harvard Medical School, Boston, Massachusetts. Electronic address: pslanetz@bidmc.harvard.edu.
2 Department of Radiology, University of Missouri Kansas City, Missouri.
3 Department of Radiology, Emory University Clinic, Atlanta, Georgia.
4 Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts.
5 Lahey Hospital and Medical Center, Burlington, Massachusetts.
6 Department of Radiology and Radiological Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee.