1. Mayo Clinic Alix School of MedicineRochesterMinnesotaUSA
2. St Paul UniversityAddis AbabaEthiopia
3. Department of Otolaryngology–Head and Neck SurgeryWashington University School of MedicineSt LouisMissouriUSA
4. Hospital Angeles LindavistaMexico CityMexico
5. Department of Otolaryngology‐Head and Neck SurgeryMayo ClinicRochesterMinnesotaUSA