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Paalanen, L., Prättälä, R., Alfthan, G. et al. Seasonal variation in plasma vitamin C concentration in Pitkäranta, Northwestern Russia. Eur J Clin Nutr 67, 1115 (2013). https://doi.org/10.1038/ejcn.2012.185
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DOI: https://doi.org/10.1038/ejcn.2012.185
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