Effects of exenatide on measures of beta-cell function after 3 years in metformin-treated patients with type 2 diabetes - Bunck, M C; Corner, A; Eliasson, B; Heine, R J; Shaginian, R M; Taskinen, M R; Smith, U; Yki-Jarvinen, H; Diamant, M (Diabetes Care, 2011)