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1. Kosin University College of Medicine, Department of Urology, Busan, Korea, 2. College of Medicine, Pusan National University, Department of Urology, Busan, Korea, 3. University of Ulsan, Asan Medical Center, Department of Urology, Seoul, Korea, 4. College of Medicine, Pusan National University, Department of Pediatrics, Busan, Korea, 5. Korea University Hospital, Department of Urology, Seoul, Korea, 6. Sungkyunkwan University Samsung Medical Center, Department of Urology, Seoul, Korea, 7. Yeungnam University Medical Center, Department of Pediatrics, Daegu, Korea, 8. Ajou University Medical Center, Department of Pediatrics, Suwon, Korea, 9. Our Lady of Mercy Hospital, The Catholic University of Korea, Department of Urology, Incheon, Korea, 10. Kangnam Sacred Heart Hospital, Hallym University, Department of Pediatrics, Seoul, Korea, 11. Chungbuk National University Hospital, Department of Pediatrics, Cheongju, Korea, 12. Yonsei University Severance Hospital, Department of Urology, Seoul, Korea
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