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First page of Correspondence re: G-S. Qian, et al., A follow-up study of urinary markers of aflatoxin exposure and liver cancer risk in Shanghai, People's Republic of China. Cancer Epidemiol., Biomarkers & Prev., 3:3-10, 1994, and C.C. Harris, Solving the viral-chemical puzzle of human liver carcinogenesis. Cancer Epidemiol., Biomarkers & Prev., 3:1-2, 1994.