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