1. Division of Sleep Surgery, Department of Otolaryngology–Head & Neck SurgeryStanford University Medical CenterStanford California U.S.A
2. Department of Otolaryngology–Head & Neck SurgeryTaipei Tzu Chi General HospitalNew Taipei City Taiwan
3. Department of Otolaryngology–Head & Neck SurgeryTzu Chi UniversityHualien Taiwan
4. Department of Otolaryngology–Head & Neck SurgeryTaipei Veterans General HospitalTaipei Taiwan
5. School of MedicineNational Yang‐Ming UniversityTaipei Taiwan