1. Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
2. Faculty of Advanced Life Science and Frontier Research Center for Post-Genome Science and Technology, Hokkaido University, Sapporo, Japan
3. Department of Advanced Transplant and Regenerative Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
4. Department of Urology, Akita University Graduate School of Medicine, Akita, Japan