1. Division of Nephrology, Endocrinology, and Vascular Medicine (Y.I., R.M., M.K., Y.O., S.I., F.S.), Sendai 980-8574, Japan
2. Departments of Radiology (K.T., K.S.), Sendai 980-8574, Japan
3. Urology (Y.A.), Sendai 980-8574, Japan
4. Pathology (Y.N., H.S.), Tohoku University Hospital, Sendai 980-8574, Japan