1. Weisburger JH, Wynder EL (1987) Etiology of colorectal cancer with emphasis on mechanisms of action and prevention. In: Devita VT, Hellman S, Rosenberg SA (eds) Important advances in oncology. Lippincott, Philadelphia, pp 197–200
2. Zanetti R, Crosignani P (1992) Cancer in Italy: incidence data from cancer registries 1983-1987. Lega Italiana per la Lotta contro i Tumori, Torino
3. Waterhouse J, Muir C, Shanmugaratnam K et al. (1982) Cancer in five continents. International Agency for Research on Cancer, Lyon, pp 680–681, 710-713 (IARC scientific publication, no 42)
4. Weisburger JH (1991) Causes, relevant mechanisms, and prevention of large bowel cancer. Semin Oncol 18:316–336
5. Doll R, Peto R (1981) The causes of cancer: quantitative estimates of avoidable risk of cancer in the United States today. JNCI 66:1191–1308