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Micronutrient concentrations by age, season, and country. Box-plots of plasma lycopene, α-tocopherol, α-carotene, and β-cryptoxanthin by (a) age in five-year age groups; (b) season; and (c) country (AUT, Austria; BEL, Belgium; GER, Germany; GRE, Greece; ITA, Italy; POL, Poland). Extreme values are included in analyses but not shown in the figure.
