1. Department of Urology; Hanyang University Seoul Hospital; Seoul Korea
2. Department of Urology; Soonchunhyang University Hospital; Soonchunhyang University Medical College; Seoul Korea
3. Department of Urology; Hanyang University Guri Hospital; Guri Korea
4. Department of Obstetrics and Gynecology; Inha University School of Medicine; Incheon Korea
5. Department of Biostatistics; Clinical Trial Center; Soonchunhyang University Bucheon Hospital; Bucheon Korea