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Barone, A., Giusti, A. & Pioli, G. Hypovitaminosis D and secondary hyperparathyroidism in the elderly: risk factors for hip fracture or markers of frailty?. Osteoporos Int 18, 1561–1562 (2007). https://doi.org/10.1007/s00198-007-0395-z
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DOI: https://doi.org/10.1007/s00198-007-0395-z