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Dose–response meta-analyses for the association between n-3 polyunsaturated fatty acids (PUFA) and the executive function based on the studies from countries where the blood level of docosahexaenoic acid (DHA) + eicosapentaenoic acid (EPA) is not very low. a Duration of intervention; b daily intake of n-3 PUFA; c total amount of n-3 PUFA taken during the study period; d daily intake of DHA; e daily intake of EPA; f ratio of DHA to EPA taken
