1. Department of Urology, Wonkwang University Sanbon Hospital, Wonkwang University School of Medicine, Gunpo, Korea.
2. Department of Urology, Wonkwang University Hospital, Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Korea.
3. Department of Urology, Severance Hospital, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
4. Center of Evidence Based Medicine, Institute of Convergence Science, Yonsei University, Seoul, Korea.