1. Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan.
3. Department of Radiology, Mie University School of Medicine, Mie Prefecture, Japan.
4. Department of Urology, Peking University Wujieping Urology Center, Peking University Shougang Hospital, Beijing, China.