Seasonal Variation in 25-Hydroxyvitamin D Concentrations in the Cardiovascular Health Study.
Shoben, Abigail B.; Kestenbaum, Bryan; Levin, Gregory; Hoofnagle, Andrew N.; Psaty, Bruce M.; Siscovick, David S.; de Boer, Ian H.; American Journal of Epidemiology, 2011, vol. 174, issue 12, p 1363, ISSN 00029262. ISBN 00029262.

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