Effect of vildagliptin compared to glimepiride on postprandial proinsulin processing in the beta cell of patients with type 2 diabetes mellitus - Forst, T; Dworak, M; Berndt-Zipfel, C; Loffler, A; Klamp, I; Mitry, M; Pfutzner, A (Diabetes Obes Metab, 2013)