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years ago breast cancer incidence in black women was very low-about 2-3 per 100,000 (standardized to World population) (Doll et al., 1970). As a comparison, in Los Angeles (USA), also in the Bay area, the incidence rate for white women is 85 per 100,000 (World population) (Waterhouse et al., 1982). Current enquiries in Eastern Transvaal indicate that(More)
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