1. Department of Otolaryngology and Head and Neck SurgeryFaculty of MedicineThe University of TokyoTokyoJapan
2. Department of Otolaryngology–Head and Neck SurgerySt Luke’s Medical CenterQuezon CityPhilippines
3. Department of OtolaryngologyTokyo Teishin HospitalTokyoJapan
4. Department of Otolaryngology and Head and Neck SurgeryNagoya City UniversityNagoyaJapan