Additional file 1.

Monthly variation of 25(OH)D and components of the humoral immune system in older Swiss. Monthly follow-up of mean ± 1 SD serum levels of 25(OH)D and humoral immune components. The IgE increment in summer likely reflects pollen exposure of the subjects. Number of samples collected per month are listed in brackets on the abscissa.

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Sakem et al. BMC Medicine 2013 11:176   doi:10.1186/1741-7015-11-176