1. From the Department of Radiology, Weill Cornell Medical Center, 416 E 55th St, New York, NY 10022 (B.A.H., Z.F., M.R.P.); Department of Radiology, Columbia College of Physicians and Surgeons, New York, NY (M.R.P.); and Department of Healthcare Policy and Research, Weill Cornell Medical College, New York, NY (Y.Z.).