1. Department of Radiology, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Republic of Korea.
2. Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
3. Department of Pathology, Yonsei University College of Medicine, Seoul, Republic of Korea.
4. Department of Pathology, Hanyang University College of Medicine, Seoul, Republic of Korea.
5. Department of Urology, Yonsei University College of Medicine, Seoul, Republic of Korea.