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Sorva, A., Risteli, J., Risteli, L. et al. Effects of vitamin D and calcium on markers of bone metabolism in geriatric patients with low serum 25-hydroxyvitamin D levels. Calcif Tissue Int 49 (Suppl 1), S88–S89 (1991). https://doi.org/10.1007/BF02555103
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DOI: https://doi.org/10.1007/BF02555103