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J Clin Endocrinol Metab. 1983 Jul;57(1):204-6.

Seasonal variation in serum concentrations of parathyroid hormone in elderly people.

Abstract

In 124 patients with femoral neck fracture and 74 aged control subjects a seasonal variation was observed in the serum concentrations of 25-hydroxyvitamin D, 24,25-dihydroxyvitamin D, and PTH. The serum PTH concentrations were maximal in winter, when the vitamin D metabolites were lowest, suggesting a secondary phenomenon.

PMID:
6853678
DOI:
10.1210/jcem-57-1-204
[Indexed for MEDLINE]
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