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1. Korea university hospital, department of urology, Seoul, Korea, 2. Seoul National University, department of electrical engineering, Seoul, Korea, 3. Seoul National university hospital, Clinical research institute, Seoul, Korea, 4. Ajou University School of Medicine, department of Urology, Suwon, Korea, 5. Inje university Seoul Paik hospital, Seoul, Korea, 6. Dankook University College of Medicine, departments of Urology, Cheonan, Korea
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