1. Department of Urology, Wonkwang University Sanbon Hospital, Wonkwang University College of Medicine, Gunpo, Korea.
2. Department of Urology, Severance Hospital, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Urology, Mubarak Al-Kabeer Hospital, Jabriya, Kuwait.
4. Department of Urology, Asir Central Hospital, Abha, Saudi Arabia.
5. Department of Urology, Najran University, Najran, Saudi Arabia.
6. Center of Evidence Based Medicine, Institute of Convergence Science, Yonsei University, Seoul, Korea.