1. School of MedicineFu‐Jen Catholic UniversityNew Taipei CityTaiwan
2. Department of Otolaryngology Head and Neck SurgeryShin Kong Wu Ho‐Su Memorial HospitalTaipeiTaiwan
3. Department of Otolaryngology Head and Neck SurgeryTaichung HospitalMinistry of Health and WelfareTaichungTaiwan
4. Institute of MedicineChung Shan Medical UniversityTaichungTaiwan