Increases in summer serum 25-hydroxyvitamin D (25OHD) concentrations in elderly subjects in São Paulo, Brazil vary with age, gender and ethnicity

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Sergio S Maeda^*, Ilda S Kunii, Lilian F Hayashi and Marise Lazaretti-Castro

BMC Endocrine Disorders 2010, 10:12 doi:10.1186/1472-6823-10-12