Warli S.M., Division of Urology, Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia, Department of Urology, Universitas Sumatera Utara, Medan, Indonesia; Pakpahan K.A., Department of Urology, Faculty of Medicine, Universitas Indonesia, Haji Adam Malik General Hospital, Medan, Indonesia; Nasution R., Division of Urology, Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Kadar D.D., Division of Urology, Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Adhyatma K.P., Division of Urology, Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia