1. From the Department of Radiology, Mayo Clinic, 13400 E Shea Blvd, Scottsdale, AZ 85259 (M.D.S., C.O.M.); Department of Radiology, University of Wisconsin Hospital, Madison, Wis (M.G.L.); Division of Diagnostic Radiology, Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, Mo (S.B., V.M.M.); Stony Brook University School of Medicine, Stony Brook, NY (M.H.K.); and Department of Radiology, NYU Winthrop Hospital, Mineola, NY (D.S.K.).