Fakhri A, Pakseresht S, Haghdoost MR, Hekmatkhah N, Torkashvand M, Ghorbanzadeh B. Memantine Enhances the Effect of Olanzapine in Patients With Schizophrenia: A Randomized, Placebo-Controlled Study. Acta Med Iran. 2016;54(11):696-703.