1. Department of Urology, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi 755-8505, Japan
2. Center for Regenerative Medicine, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi 755-8505, Japan
3. Department of Urology, Japan Community Health Care Organization Tokuyama Central Hospital, Shunan, Yamaguchi 745-8522, Japan
4. Kawai Urological Clinic, Hofu, Yamaguchi 747-0836, Japan
5. Department of Systems Biochemistry in Pathology and Regeneration, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi 755-8505, Japan