Indrawan, D.H., Department of Urology, Faculty of Medicine, Universitas Indonesia – Haji Adam Malik General Hospital Medan, Jl. Bunga Lau No.17, Kemenangan Tani, Kec. Medan Tuntungan, Kota Medan, Sumatera Utara, 20136, Indonesia; Sigumonrong, Y., Division of Urology, Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara – Haji Adam Malik General Hospital Medan, Jl. Bunga Lau No.17, Kemenangan Tani, Kec. Medan Tuntungan, Kota Medan, Sumatera Utara, 20136, Indonesia