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First page of Correspondence re: R. Peto <italic>et al.</italic>, Effects on 4080 Rats of Chronic Ingestion of <italic>N</italic>-Nitrosodiethylamine or <italic>N</italic>-Nitrosodimethylamine: A Detailed Dose-Response Study. Cancer Res., <italic>51:</italic> 6415–6451, 1991, and K. S. Crump <italic>et al.</italic>, Fundamental Carcinogenic Processes and Their Implications for Low Dose Risk Assessment. Cancer Res., <italic>36:</italic> 2973–2979, 1976.