DOI:
10.1055/s-00000135
Deutsche Heilpraktiker-Zeitschrift
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References
Laaksi I, Ruohola JP, Tuohimaa P. et al An association of serum vitamin D concentrations < 40 nmol/L with acute respiratory tract infection in young Finnish men.
Am J Clin Nutr. 2007;
86: 714-717
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