1. From the Department of Diagnostic Radiology, Oregon Health and Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, 97239 (R.D.M., B.R.B., S.S., B.G.H.); Department of Radiology and Imaging Sciences, University of Utah, Salt Lake City, Utah (M.K.M., C.J.H., R.L.L., H.A.); Department of Diagnostic Radiology, University of Pittsburgh Medical Center, Pittsburgh, Pa (D.D.W.); and private practice, Eugene, Ore (M.T.).