1. Division of Diabetes, Metabolism and Endocrinology, Showa University Fujigaoka Hospital, Yokohama, Kanagawa 227-8501, Japan
2. Departments of Pathology, Showa University Fujigaoka Hospital, Yokohama, Kanagawa 227-8501, Japan
3. Division of Urology, Showa University Fujigaoka Hospital, Yokohama, Kanagawa 227-8501, Japan