M. Jameshorani, S. Sayari, N. Kiahashemi, and N. Motamed, “Comparative Study on Adding Pioglitazone or Sitagliptin to Patients with Type 2 Diabetes Mellitus Insufficiently Controlled With Metformin”, Open Access Maced J Med Sci, vol. 5, no. 7, pp. 955–962, Dec. 2017.