ABSTRACT
REFERENCES 1. Doll, R., and R. Peto, The causes of cancer: quantitative estimates of avoidable risks of
cancer in the United States today,J. Natl. Cancer Inst. 66:1191-1308 (1981). 2. American Cancer Society, Cancer Facts and Figures, Atlanta, GA, 1982. 3. Armstrong, B., and R. Doll, Environmental factors and cancer incidence and mortality
in different countries with special reference to dietary practices, Int. J. Cancer 15: 617-631 (1975).