1. Department of Urology, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Department of Urology, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Urology, Inje University College of Medicine, Busan, Korea.
4. Institute Urology and Nephrology, Hospital Kuala Lumpur, Kuala Lumpur, Malaysia.