1. Department of Urology, Kyungpook National University School of Medicine, Daegu, Korea.
2. Department of Urology, Wonkwang University School of Medicine and Hospital, Iksan, Korea.
3. Department of Urology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
4. Department of Urology, Jeonbuk National University Medical School, Jeonju, Korea.
5. Department of Urology, Pusan National University Yangsan Hospital, Yangsan, Korea.
6. Department of Urology, Eulji University Hospital, Eulji University School of Medicine, Daejeon, Korea.
7. Department of Urology, Chungbuk National University College of Medicine, Cheongju, Korea.