The NS, Crandell JL, Lawrence JM, King IB, Dabelea D, Marcovina SM, D'Agostino RB, Norris JM, Pihoker C, Mayer-Davis EJ. Vitamin D in youth with Type 1 diabetes: prevalence of insufficiency and association with insulin resistance in the SEARCH Nutrition Ancillary Study. Diabet Med. 2013 Nov; 30(11):1324-32.