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Gordon, Catherine M., Henry A. Feldman, Linda Sinclair, Avery LeBoff Williams, Paul K. Kleinman, Jeannette Perez-Rossello, and Joanne E. Cox. Prevalence of Vitamin D Deficiency Among Healthy Infants and Toddlers. 2008.

Gordon, Catherine M., et al. Prevalence of Vitamin D Deficiency Among Healthy Infants and Toddlers. 2008.