1. Division of Otolaryngology Head and Neck Surgery, Cedars-Sinai Medical Center, Los Angeles, CA, USA
2. Department of Otolaryngology Head and Neck Surgery, Mayo Clinic, Rochester, MN, USA
3. St. Cloud Ear, Nose & Throat, St. Cloud, MN, USA
4. Otolaryngology Head and Neck Surgery, HealthPartners, Minneapolis, MN, USA
5. Prairie Sinus, Ear & Allergy, Bismarck, ND, USA