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1. Department of Urology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea, 2. Department of urology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Gyongsangnam-do, Korea, 3. Department of Urology, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
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