1. Department of Urology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
2. Uh Urology Clinic, Seoul, Korea.
3. Department of Urology, Sanggye Paik Hospital, Inje University, Seoul, Korea.
4. Department of Urology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
5. Department of Urology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.