1. Robboy, S.J. et al. in Essential Pathology (eds Rubin, E . & Farber, J.L) 516–525 (J.B. Lippincott, Philadelphia, 1995).
2. Fujimoto, I. et al. in Cancer Incidence and Mortality Statistics in Osaka, 1963–1989 (eds Fujimoto, I. et al) 49–214 (Shinohara, Osaka, Japan, 1993).
3. Okamoto, A. et al. Cancer Res. 51, 5632–5635 (1991).
4. Enomoto, T. et al. Cancer Res. 50, 6139–6145 (1990).
5. Li, J. et al. Science 275, 1943–1947 (1997).