Institution: | 1. Department of Otolaryngology/Head and Neck Surgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu, Shizuoka, 431-3192, Japan 2. Department of Otolaryngology/Head and Neck Surgery, Jichi Medical University, Tochigi, Japan 3. Department of Otolaryngology/Head and Neck Surgery, University of the Ryukyus, Okinawa, Japan
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