Effect of a randomised controlled vitamin D trial on insulin resistance and glucose metabolism in patients with type 2 diabetes mellitus - Strobel, F; Reusch, J; Penna-Martinez, M; Ramos-Lopez, E; Klahold, E; Klepzig, C; Wehrle, J; Kahles, H; Badenhoop, K (Horm Metab Res, 2014)