The effect of cholecalciferol supplementation on vitamin D levels and insulin sensitivity is dose related in vitamin D-deficient HIV-1-infected patients. - van den Bout-van den Beukel, C.J.P.; van den Bos, M.; Oyen, W.J.G.; Hermus, Ad. R.M.M.; Sweep, F.C.G.J.; Tack, C.J.J.; Bosch, M.E.W.; Burger, D.M.; Koopmans, P.P.; van der Ven, A.J.A.M. (HIV Medicine, 2008)