Allain TJ, Dhesi J. Hypovitaminosis D in older adults. Gerontol. 2003;49: 273-278.
American Academy of Dermatology. Position statement on vitamin D. American Academy of Dermatology website. Available at: http://www.aad.org/Forms/Policies/Uploads/PS/PS-Vitamin%20D.pdf. Updated November 14, 2009. Accessed November 7, 2017.
Dietary supplement fact sheet: vitamin D. Office of Dietary Supplements website. Available at: http://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/. Updated February 11, 2016. Accessed November 7, 2017.
Pfeifer M, Begerow B, et al. Vitamin D and muscle function. Osteoporosis Int. 2002;13:187-194.
Plotnikoff GA, Quigley JM. Prevalence of severe hypovitaminosis D in patients with persistent, nonspecific musculoskeletal pain. Mayo Clin Proc. 2003; 78:1463.
Tangpricha V, Pearce EN, et al. Vitamin D insufficiency among free-living healthy young adults. Am J Med. 2002;112:659-662.
Vitamin D deficiency in adults. EBSCO DynaMed Plus website. Available at:http://www.dynamed.com/topics/dmp~AN~T113821/Vitamin-D-deficiency-in-adults. Updated October 9, 2017. Accessed November 7, 2017.
Wagner CL, Greer FR, American Academy of Pediatrics Section on Breastfeeding, American Academy of Pediatrics Committee on Nutrition. Prevention of rickets and vitamin D deficiency in infants, children, and adolescents. Pediatrics. 2008;122:1142-1152.