1. Department of Urology, Kyungpook National University Chilgok Hospital, Daegu, Korea.
2. Department of Urology, Kyungpook National University Hospital, Daegu, Korea.
3. Department of Urology, School of Medicine, Kyungpook National University, Daegu, Korea.
4. Department of Urology, Jikei University School of Medicine, Tokyo, Japan.