1. From the Departments of Management Science and Engineering (A.M.J.) and Medicine (Biomedical Informatics Research) (D.L.R.), Stanford University, Stanford, Calif; and Departments of Health Research and Policy (W.S., J.H.R., V.M., A.S.W.) and Radiology (J.A.L., D.L.R.), Stanford University School of Medicine, 1201 Welch Rd, Office P285, Stanford, CA 94305.