1. Department of Urology, The Jikei University Kashiwa Hospital, Kashiwa, Chiba, Japan
2. Department of Urology, The Jikei University School of Medicine, Minato-ku, Tokyo, Japan
3. Department of Pathology, The Kyorin University School of Medicine, Mitaka-shi, Tokyo, Japan
4. Department of Pathology, The Jikei University School of Medicine, Minato-ku, Tokyo, Japan