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1. Department of Urology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea, 2. 1Department of Urology, Eulji University Hospital, Eulji University College of Medicine, Daejeon, Korea, 3. 2Departments of Urology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea, 4. Department of Urology, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
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