1. Department of Urology, Toyooka Hospital, Toyooka, Hyogo 668‑8501, Japan
2. Department of Diagnostic Pathology, Toyooka Hospital, Toyooka, Hyogo 668‑8501, Japan
3. Department of Surgical Pathology, Tokyo Women's Medical University, Tokyo 162‑8666, Japan
4. Clinical Research Institute and Department of Pathology, Kanagawa Children's Medical Center, Yokohama, Kanagawa 232‑8555, Japan
5. Professor Emeritus, Kansai Medical University, Hirakata, Osaka 573‑1010, Japan