DOI: 10.1055/s-00000009

American Journal of Perinatology

References

Vieth R, Ladak Y, Walfish PG.
Age-related changes in the 25-hydroxyvitamin D versus parathyroid hormone relationship suggest a different reason why older adults require more vitamin D 
J Clin Endocrinol Metab 2003; 88: 185-191  

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