1. Mansbach JM, Ginde AA, Camargo CA. Serum 25-hydroxyvitamin D levels among US children aged 1 to 11 years: do children need more vitamin D?Pediatrics. 2009;124(5):1404–1410
2. US Census Bureau. 2005–2007 American community survey. Available at: http://factfinder.census.gov. Accessed June 24, 2009
3. Institute of Medicine, Standing Committee on the Scientific Evaluation of Dietary Medicine. Calcium, phosphorus magnesium, vitamin D and fluoride. In: Dietary Reference Intakes. Washington, DC: National Academy Press; 1997:250–287
4. Wagner CL, Greer FR; American Academy of Pediatrics, Section on Breastfeeding and Committee on Nutrition. Prevention of rickets and vitamin D deficiency in infants, children, and adolescents [published correction appears in Pediatrics. 2009;123(1):197]. Pediatrics. 2008;122(5):1142–1152
5. Cranney A, Horsley T, O'Donnell S, et al. Evidence Report/Technology Assessment No. 158: Effectiveness and Safety of Vitamin D in Relation to Bone Health. Rockville, MD: Agency for Healthcare Research and Quality; 2007. AHRQ publication No. 07-E013