1. From the Department of Radiology, University of Washington, Seattle, Wash (K.M.K.); Departments of Quality and Safety (P.F.B., M.B.) and National Radiology Data Registries (D.S., L.P.C.), American College of Radiology, 1891 Preston White Dr, Reston, VA 20191; and Department of Radiology, Mayo Clinic Florida, Jacksonville, Fla (R.L.M.).