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Bergman, Peter, Anna-Carin Norlin, Susanne Hansen, Rokeya Sultana Rekha, Birgitta Agerberth, Linda Björkhem-Bergman, Lena Ekström, Jonatan D. Lindh, and Jan Andersson. Vitamin D(3) Supplementation in Patients With Frequent Respiratory Tract Infections: A Randomised and Double-blind Intervention Study. BMJ Publishing Group, 2012.

Bergman, Peter, et al. Vitamin D(3) Supplementation in Patients With Frequent Respiratory Tract Infections: A Randomised and Double-blind Intervention Study. BMJ Publishing Group, 2012.