1. Department of Pathology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.
2. Department of Urology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.
3. Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Pathology, International St. Mary's Hospital, Incheon, Korea.
5. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.