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1. Department of Urology, Sungkyunkwan University School of Medicine, Seoul, Korea, 2. Department of Urology, University of Ulsan College of Medicine, Seoul, Korea, 3. Department of Urology, College of Medicine, Korea University, Seoul, Korea, 4. Department of Urology, College of Medicine, Konkuk University, Seoul, Korea, 5. Department of Urology, National Health Insurance Corporation Ilsan Hospital, Ilsan, Korea
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