1. Department of Urology; Bucheon St. Mary's Hospital; College of Medicine; The Catholic University of Korea; Bucheon Korea
2. Department of Urology; Dongnam Institute of Radiological and Medical Sciences; Cancer Center; Busan Korea
3. Department of Urology; Seoul St. Mary's Hospital; College of Medicine; The Catholic University of Korea; Seoul Korea
4. The Cancer Research Institute; The Catholic University of Korea; Seoul Korea
5. Department of Biostatistics; College of Medicine; The Catholic University of Korea; Seoul Korea