Calcium plus vitamin D supplementation and the risk of incident diabetes in the Women’s Health Initiative - de Boer, I H; Tinker, L F; Connelly, S; Curb, J D; Howard, B V; Kestenbaum, B; Larson, J C; Manson, J E; Margolis, K L; Siscovick, D S; Weiss, N S (Diabetes Care, 2008)