1. From the Department of Radiology, Palmer College of Chiropractic–West Campus, 90 E Tasman Dr, San Jose, CA 95134 (M.R.S.); Department of Radiology, Cedars-Sinai Medical Center, Los Angeles, Calif (G.R.M.); and Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, Calif (D.B.P., A.T., E.A.W., J.S.G.).