Efficacy and safety of sitagliptin monotherapy in Japanese patients with type 2 diabetes. - Nonaka,K.; Kakikawa,T.; Sato,A.; Okuyama,K.; Fujimoto,G.; Kato,N.; Suzuki,H.; Hirayama,Y.; Ahmed,T.; Davies,MJ.; Stein,PP. (Diabetes Res Clin Pract, 2008)