1. Department of Otolaryngology, Tokyo Kyosai Hospital, Tokyo, Japan;
2. Department of Otolaryngology, Tokyo Women’s Medical University Medical Center East, Tokyo, Japan;
3. Department of Otolaryngology-Head and Neck Surgery, Nihon University School of Medicine, Tokyo, Japan;
4. Department of Otolaryngology, University Aix Marseille II L’Hôpital Nord, Marseille, France;
5. Department of Otorhinolaryngology, Jikei University School of Medicine, Tokyo, Japan;
6. Department of Public Health, Nihon University School of Medicine, Tokyo, Japan