5-alpha Reductase Inhibitors Adrenergic alpha-Antagonists Age Factors Humans Male Prostatic Hyperplasia/complications/physiopathology Time Factors Treatment Failure Treatment Outcome Urinary Bladder Underactive/complications/*physiopathology Urinary Retention/etiology/*physiopathology Benign prostatic enlargement Benign prostatic hyperplasia Bladder outlet obstruction Delayed prostatectomy Lower urinary tract symptoms