1. Department of Urology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
2. Department of Urology, University of Iowa, Iowa City, Iowa
3. Department of Molecular and Cellular Pathology, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
4. Department of Pathology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
5. Japanese Red Cross Medical Center, Tokyo, Japan