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Yokoh, Hidetaka, et al. "Efficacy and Safety of the Dipeptidyl Peptidase-4 Inhibitor Sitagliptin Compared With Alpha-glucosidase Inhibitor in Japanese Patients With Type 2 Diabetes Inadequately Controlled On Metformin or Pioglitazone Alone (Study for an Ultimate Combination Therapy to Control Diabetes With Sitagliptin-1): A Multicenter, Randomized, Open-label, Non-inferiority Trial." J Diabetes Investig 2015.

Yokoh, Hidetaka, et al. "Efficacy and Safety of the Dipeptidyl Peptidase-4 Inhibitor Sitagliptin Compared With Alpha-glucosidase Inhibitor in Japanese Patients With Type 2 Diabetes Inadequately Controlled On Metformin or Pioglitazone Alone (Study for an Ultimate Combination Therapy to Control Diabetes With Sitagliptin-1): A Multicenter, Randomized, Open-label, Non-inferiority Trial." J Diabetes Investig 2015.