1. Departments of Urology, Center for Urological Cancer, National Cancer Center, Goyang, Korea
2. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
3. Keimyung University School of Medicine, Daegu, Korea
4. University of Ulsan College of Medicine, Asan Medical Center, Daegu, Korea