The urodynamic parameters include maximal urethral closure pressure (MUCP), functional profile length (FPL), cystometric bladder capacity (CBC), bladder compliance, voiding detrusor pressure (Pdet), maximal flow rate (Qmax), voided volume, and postvoid residual urine volume (PVR). In the patients who have detrusor underactivity, the abdominal pressure to urinate and the detrusor leak point pressure will be measured. Images of voiding cystourethrography will be emphasized on the bladder neck opening, urethral sphincter relaxation, and dilatation of posterior urethra during voiding.