supported publications or other works Low Serum 25-Hydroxyvitamin D Level and Risk of Upper Respiratory Tract Infection in Children and Adolescents Journal Articles Microneutralization Assay Titres Correlate with Protection against Seasonal Influenza H1N1 and H3N2 in Children Journal Articles Prevalence and predictors of low serum 25-hydroxyvitamin D levels in rural Canadian children Journal Articles Serum 25-Hydroxyvitamin D Level and Influenza Vaccine Immunogenicity in Children and Adolescents Journal Articles