1. Department of Otolaryngology–Head and Neck SurgeryUniversity of Colorado School of MedicineAurora Colorado U.S.A.
2. Department of Internal MedicineUniversity of Utah School of MedicineSalt Lake City Utah U.S.A.
3. Department of Biostatistics and Informatics, University of ColoradoColorado School of Public HealthAurora Colorado U.S.A.