Comprehensive Cancer Ccnter, University of North Carolina, Chapel Hill; and the $Department of Pathology, Duke University Medical Center, Durham, North Carolina. The authors thank Ms. Kathy Sutton for her word processing, editing, and bibliographic work. Address for reprints: Barbara S. Hulka, M.D., M.P.H., Department of Epidemiology, School of Public Health, University of North Carolina, CB 7400, McGavran-Greenberg Hall, Chapel Hill, NC 27599-7400. Accepted for publication April 14, 1994. to…
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