B. Gys, F. Haenen, T. Gys, and T. Lafullarde, “Mid-term effect of Roux-en-Y gastric bypass on type 2 diabetes mellitus: a retrospective single surgeon observational study with focus on anti-diabetic medication”, J Surg Cl Res, vol. 7, no. 2, pp. 40–49, Mar. 2017.