KLK3 and benign prostatic hyperplasia: As such, we were not able to consistently evaluate the metrics of BPH impact index (BPHll), peak flow rate (Qmax), post-void residual volume (PVR), prostate-specific antigen (PSA), International Index of Erectile Function-5 (IIEF-5), and Male Sexual Health Questionnaire for Ejaculatory Dysfunction (MSHQ-EjD), all of which were evaluated in previous comparative studies [17-22].