Warli S.M., Division of Urology, Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara - Haji Adam Malik General Hospital; Ginting J.T., Department of Urology, Faculty of Medicine, Universitas Indonesia - Haji Adam Malik General Hospital, Indonesia; Sihombing B., Division of Urology, Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara - Haji Adam Malik General Hospital, Indonesia; Siregar G.P., Division of Urology, Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara - Haji Adam Malik General Hospital, Indonesia; Prapiska F.F., Division of Urology, Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara - Haji Adam Malik General Hospital, Indonesia