1Department of Pediatrics, Institute of Health Sciences, Gyeongsang National University, School of Medicine, Jinju, Korea.
2Department of Otolaryngology, Institute of Health Sciences, Gyeongsang National University, School of Medicine, Jinju, Korea.
3Department of Urology, Institute of Health Sciences, Gyeongsang National University, School of Medicine, Jinju, Korea.
4Department of Medical Education, School of Medicine, University of Michigan, Ann Arbor, Michigan, USA.
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