1. Department of Urology, Dong-A University College of Medicine, Busan, Korea.
2. Department of Urology, Dongnam Inst. Radiological & Medical Sciences, Busan, Korea.
3. Department of Urology, Youngdo Hospital, Busan, Korea.
4. Department of Urology, Maryknoll Hoapital, Busan, Korea.
5. Department of Urology, Bumin Hospital, Busan, Korea.
6. Department of Urology, Dong Rae Bong Seng Hospital, Busan, Korea.