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1. Department of Urology, Soonchunhyang University Hospital, Seoul, Korea, 2. Medical Research Institute, Chung-Ang University College of Medicine, Seoul, Korea, 3. Department of Radiology, Seoul National University Hospital, Seoul, Korea, 4. Department of Internal Medicine, Soonchunhyang University Hospital, Seoul, Korea, 5. Department of Urology, Kyunhee University Hospital, Seoul, Korea
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