Affiliation: | 1. Department of Urology, Chuncheon Sacred Hospital, Hallym University College of Medecine, , Chuncheon, Korea;2. Department of Urology, Changi General Hospital, , Singapore;3. Department of Urology, General Hospital of Nikaia ‘St. Panteleimon’, , Athens, Greece;4. Biostatistics Collaboration Unit, Yonsei University College of Medicine, , Seoul, Korea;5. Department of Urology, Urological Science Institute, , Seoul, Korea |