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Masatoyo AKIYOSHI
Institute for the Deaf, School of Medicine, Tokyo Medical and Dental University [Japan]
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Akira AMEMIYA
Institute for the Deaf, School of Medicine, Tokyo Medical and Dental University [Japan]
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Takehiro YANAGISAWA
Dept. of Oto-rhino-laryngology, School of Medicine, Tokyo Medical and Dental University [Japan]