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1. Inha University Hospital, 2. Dept of Urology, Inha University Hospital, Incheon, Korea, 3. Dept of Urology, Chungnam National University of Medicine, Daejeon, Korea, 4. Dept of Urology, Nankook College of Medicine, Cheonam, Korea, 5. Dept of Urology, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea
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