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    Intestinal polyps in American negroes and Nigerian africans

    Forty Africans from Nigeria and 89 American negroes with colorectal polyps were analysed by age, sex and type of polyp. The Nigerians were much the younger group (mostly under 20 years of age, whereas most of ...

    A O Williams, E B Chung, A Agbata, M A Jackson in British Journal of Cancer (1975)