V. Korkmaz, E. Özkaya, T. Küçüközkan, F. Kara, Y. Çekmez, and H. Korkmaz, “Medroxyprogesterone Acetate Plus Metformin to Prevent Persistent Endometrial Hyperplasia”, Gynecol Obstet Reprod Med, vol. 19, no. 2, pp. 96–99, Aug. 2013.