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McNaughton SA, Marks GC, Gaffney P, Williams G, Green A. Validation of a food-frequency questionnaire assessment of carotenoid and vitamin E intake using weighed food records and plasma biomarkers: The method of triads model. European Journal of Clinical Nutrition. 2004 Oct 13;59(2):211–8. doi: 10.1038/sj.ejcn.1602060. |