Kim SH, Brodsky IG, Chatterjee R, Kashyap SR, Knowler WC, Liao E, Nelson J, Pratley R, Rasouli N, Vickery EM, Sarnak M, Pittas AG. Effect of Vitamin D Supplementation on Kidney Function in Adults with Prediabetes: A Secondary Analysis of a Randomized Trial. Clin J Am Soc Nephrol. 2021 08; 16(8):1201-1209.