Calcif Tissue Int (Review). 99 (3): 227–36. doi:10.1007/s00223-016-0146-2. PMID 27245342. ↑ Kennel, Kurt, MD et al., Vitamin D Deficiency in Adults: When to Test and How to Treat, Mayo Clinic Proceedings, August 2010, pp752–758 ↑ http://www.iom.edu/Reports/2010/Dietary-Reference-Intakes-for-Calcium-and-Vitamin-D.aspx ↑ Kingsbury, Kathleen (2008-10-13).