1. Cancer statistics, 1986;Silverberg;Ca,1986
2. SEER Program: Cancer incidence and mortality in the United States 1973–1981;Horm,1984
3. Cancer Incidence in Five Continents;Waterhouse,1982
4. Geographic patterns of large bowel cancer in the United States;Blot;JNCI,1976
5. Related disease—related cause;Burkitt;Lancet,1969