1. Department of Urology, Tokai University School of Medicine, Isehara, Kanagawa 259-1193, Japan
2. Department of Pathology, Tokai University School of Medicine, Isehara, Kanagawa 259-1193, Japan
3. Department of Preventive Medicine, Tokai University School of Medicine, Isehara, Kanagawa 259-1193, Japan
4. Department of Clinical Pharmacology, Tokai University School of Medicine, Isehara, Kanagawa 259-1193, Japan