1. Department of Urology, Kangwon National University School of Medicine, Chuncheon, Korea.
2. Department of Urology, Wonju Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea.
3. Department of Urology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
4. Department of Urology, Hallym University Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
5. Department of Clinical Diagnosis, Kangwon National University School of Medicine, Chuncheon, Korea.