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nightsurfer on 2009-09-22Vitamin D status affects serum parathyroid hormone concentrations during winter in female adolescents: associations with forearm bone mineral density.
Outila TA, Kärkkäinen MU, Lamberg-Allardt CJ.
Am J Clin Nutr. 2001 Aug;74(2):206-10.
Conclusion: A large percentage of adolescent females have low vitamin D status during the winter in Finland, which seems to have negative effects on bone health.