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Participant flow chart from the 2015–2016 Malawi Micronutrient Survey and supplementary vitamin A biomarker analysis. Men (20–54 y); MRDR, modified relative dose response; PSC, preschool age children (6–59 mo); RBP, retinol binding protein; SAC, school age children (5–14 y); WRA, women of reproductive age (15–49 y).
