1. National Institute of Sensory Organs, National Tokyo Medical Center, Tokyo, Japan
2. Department of Otorhinolaryngology, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
3. Speech-Language-Hearing Therapist Department of Social Welfare, Faculty of Humanities and Social Sciences, Showa Women’s University, Tokyo, Japan
4. Department of Otolaryngology, Kamio Memorial Hospital, Tokyo, Japan