Sildenafil prevents chronic psychosocial stress-induced working memory impairment: Role of brain-derived neurotrophic factor oleh Tareq I. Jibril, Karem H. Alzoubi, Nizar M. Mhaidat, Omar F. Khabour, Mohammad A.Y. Alqudah, Abeer M. Rababa’h, Nasr Alrabadi, Doaa Al-udatt