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Percentage of the study sample with serum 25-hydroxyvitamin D concentrations <10 ng/ml (
), 10–<15 ng/ml (
), 15–<20 ng/ml (
), 20–<30 ng/ml (
) and ≥30 ng/ml (
) according to season: adolescents aged 12–18 years (n 1510), Korea National Health and Nutrition Examination Survey (KNHANES) 2008–2009
