1. From the Department of Radiology, Duke University School of Medicine, 10 Duke Medicine Cir, Durham, NC 27710 (D.L.N., J.Y.L., L.J.G.); Pratt School of Engineering (Y.R.) and Department of Biostatistics and Bioinformatics (T.M.J., S.M.T.), Duke University, Durham, NC; and iCAD, Nashua, NC (Y.R.).