1. Department of Urology, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
2. Department of Urology, College of Medicine, Hallym University, Kangdong Sacred Heart Hospital, Seoul, Republic of Korea
3. Yonsei Wonju Medical Library, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
4. Department of Urology, Yonsei University Wonju College of Medicine, 20Ilsan-ro, Wonju 220-701, Kangwon-do, Republic of Korea