1. Division of Urology, Penghu Hospital, Penghu 880001, Taiwan, R.O.C.
2. Division of Urology, Department of Surgery, E‑Da Hospital, Kaohsiung 824005, Taiwan, R.O.C.
3. Department of Urology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan 704302, Taiwan, R.O.C.