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Vitamin D levels in relation to other calcium and phosphate regulating hormones in children in Murmansk and Groningen. Effect of summer and winter. A pilot study.

Approved WMORecruitment stopped

Objective: To obtain data to be used for designing a larger scale study on the incidence of 25OHD levels below the recommended level of 50 nmol/l in children in Murmansk, Russia and Groningen, the Netherlands.