Gallo S, Comeau K, Vanstone C, Agellon S, Sharma A, Jones G, L’Abbé M, Khamessan A, Rodd C, Weiler H. Effect of different dosages of oral vitamin D supplementation on vitamin D status in healthy, breastfed infants: a randomized trial. JAMA 2013; 309(17):1785-92. View abstract.