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Coates, J., Eley, G., Block, G., Gunther, E.W., Sowell, A.L., Grossman, C. and Greenberg, R.S. (1991) An evaluation of a food frequency questionnaire for assessing dietary intake of specific carotenoids and vitamin E among low-income black women. American Journal of Epidemiology, 134, 658-671.

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