1. Department of Otolaryngology, Nippon Medical School, Chiba Hokusoh Hospital
2. Department of Otolaryngology and Pediatric otolaryngology, Tokyo Women's Medical University, Yachiyo Medical Center
3. Department of Otolaryngology, Nippon Medical School, Musashi Kosugi Hospital
4. Department of Neurology, Nippon Medical School Hospital
5. Department of Neurology, Nippon Medical School, Musashi Kosugi Hospital