Roux-en-Y gastric bypass and sleeve gastrectomy: mechanisms of diabetes remission and role of gut hormones - Nannipieri, M; Baldi, S; Mari, A; Colligiani, D; Guarino, D; Camastra, S; Barsotti, E; Berta, R; Moriconi, D; Bellini, R; Anselmino, M; Ferrannini, E (J Clin Endocrinol Metab., 2013)