1. Department of Radiology, Okayama University Hospital, 2-5-1 Shikata-cho kita-ku, Okayama, 700-8558, Japan.
2. Department of Medical Informatics, Okayama University Hospital, Okayama, Japan.
3. Department of Pathology, Okayama University Hospital, Okayama, Japan.
4. Department of Urology, Okayama University Hospital, Okayama, Japan.