Screening Asymptomatic Men for Prostate Cancer Using Prostate-Specific Antigen as An Early Detection Tool: A Review of Existing Literature Tobechukwu Joseph Okobi MD1*, Trinitas Oserefuamen Uhomoibhi MD2, Okelue Edwards Okobi MD3, Ekejiuba Courage Onyebuchi MBBS4, Emmanuel O. Egberuare MD5, Ijeoma C. Izundu MD6, Oluwarotimi A. Ogunlami MD7, Aisha M.T Abubakar