1. From the Russell H. Morgan Department of Radiology and Radiological Science (A.C.O., E.H.H., A.J.M., N.A., M.A.K.), Department of Pathology (L.M.R.), and Department of Otolaryngology–Head and Neck Surgery (L.M.A., S.R.B.), Johns Hopkins University School of Medicine, 1800 Orleans St, Baltimore. MD 21287.