Empagliflozin as Add-On to Metformin in Patients With Type 2 Diabetes: A 24-Week, Randomized, Double-Blind, Placebo-Controlled Trial. - Häring, Hans-Ulrich; Merker, Ludwig; Seewaldt-Becker, Elke; Weimer, Marc; Meinicke, Thomas; Broedl, Uli C.; Woerle, Hans J. (Diabetes Care, 2014)