Affiliation: | 1. Department of Preventive Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611, U.S.A.;2. Department of Biostatistics, M. D. Anderson Cancer Center, University of Texas, Houston, Texas 77030, U.S.A.;3. Vital Systems Inc., Rolling Meadows, Illinois 60008, U.S.A.;4. Department of Surgical Oncology, M. D. Anderson Cancer Center, University of Texas, Houston, Texas 77030, U.S.A. |