DOI:
10.1055/s-00000025
Hormone and Metabolic Research
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References
Bergman P, Norlin A-C, Hansen S. et al.
Vitamin D3 supplementation in patients with frequent respiratory tract
infections: A randomised and double-blind intervention study.
BMJ Open 2012;
2: e001663.
DOI: 10.1136/bmjopen-2012-001663.
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