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1. Department of Urology, Incheon St. Mary's Hospital, The Catholic University of Korea, Incheon, Korea, 2. Department of Urology, Bucheon St. Mary's Hospital, The Catholic University of Korea, 3. Department of Urology, St. Paul's Hospital, The Catholic University of Korea, 4. Department of Urology, Bucheon Soonchunhyang Hospital, Soonchunhyang University, 5. Department of Urology, Ajou University Hospital, 6. Department of Urology, Mizmedi General Hospital
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