1. From the Departments of Medicine (G.M., L.J.L., F.M., C.A.B., A.V.P., Z.Y., K.A., V.M.-A., J.D.M., D.K.H., R.M.L., A.R.P.) and Radiology (R.M.L., A.R.P.), University of Chicago, IL; Department of Medicine, Mayo Clinic, Phoenix, AZ (J.F.B.); and Department of Medicine, University of Illinois at Chicago (N.J.S.).