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[\'Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo, Japan.\', \'Department of Otolaryngology, Head and Neck Surgery, Nihon University School of Medicine, Tokyo, Japan.\', \'Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo, Japan. Electronic address: morioka.ichiro@nihon-u.ac.jp.\']
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