Canagliflozin compared with sitagliptin for patients with type 2 diabetes who do not have adequate glycemic control with metformin plus sulfonylurea: A 52-week randomized trial - Schernthaner, G; Gross, J L; Rosenstock, J; Guarisco, M; Fu, M; Yee, J; Kawaguchi, M; Canovatchel, W; Meininger, G (Diabetes Care, 2013)