1. Department of Radiology, St. Luke's International Hospital, Akashi-cho 9-1, Chuo-ku, Tokyo 104-8560, Japan.
2. Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
3. Department of Urology, St. Luke's International Hospital, Tokyo, Japan.
4. Department of Pathology, St. Luke's International Hospital, Tokyo, Japan.
5. Immuno-Rheumatology Center, St. Luke's International Hospital, Tokyo, Japan.