1. Department of Urology, National Hospital Organization, Kyoto Medical Center, Kyoto 612-8555, Japan
2. Department of Urology, Institute of Medicine, University of Tsukuba, Tsukuba 305-8575, Japan
3. Department of Urology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
4. Department of Biological Chemistry, College of Bioscience and Biotechnology, Chubu University, Kasugai 487-8501, Japan
5. Division of Preventive Medicine, Clinical Research Institute, National Hospital Organization, Kyoto Medical Center, Kyoto 612-8555, Japan