H. L. Katzeff

Long-term efficacy of sitagliptin as either monotherapy or add-on therapy to metformin: improvement in glycemic control over 2 years in patients with type 2 diabetes

B. Goldstein, S. Engel, G. Golm, 2015, Current medical research and opinion.

Efficacy and safety of monotherapy of sitagliptin compared with metformin in patients with type 2 diabetes

K. Kaufman, P. Aschner, H. Katzeff, 2010, Diabetes, obesity & metabolism.

The incidence of hypoglycaemia in Muslim patients with type 2 diabetes treated with sitagliptin or a sulphonylurea during Ramadan: a randomised trial

I. Harman-boehm, L. Radican, S. Engel, 2011, International journal of clinical practice.