1. From the Departments of Surgery, Radiology, and Biochemistry, University of Vermont Cancer Center, University of Vermont, 1 S Prospect St, UHC Room 4425, Burlington, VT 05401 (B.L.S.); Group Health Research Institute, Group Health Cooperative, Seattle, Wash (R.F.A., D.S.M.B.); Division of Biostatistics, Department of Public Health Sciences, University of California Davis School of Medicine, Davis, Calif (D.L.M....