1. Department of Urology, School of Medicine, Kyungpook National University, Daegu, Korea.
2. Joint Institute for Regenerative Medicine, Kyungpook National University Hospital, Daegu, Korea.
3. Department of Urology, College of Medicine, Chungbuk National University, Cheongju, Korea.
4. Department of Urology, College of Medicine, Yeungnam University, Daegu, Korea.
5. Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, USA.