1. Department of Otolaryngology‐Head and Neck Surgery University of Michigan Ann Arbor Michigan USA
2. Division of Otolaryngology – Head and Neck Surgery, Department of Surgery University of Utah Salt Lake City Utah USA
3. Division of Rhinology and Sinus Surgery/Oregon Sinus Center, Department of Otolaryngology–Head and Neck Surgery Oregon Health & Science University Portland Oregon USA
4. Department of Otolaryngology‐Head and neck Surgery, Department of Neurosurgery Johns Hopkins University School of Medicine Baltimore Maryland USA
5. Department of Otolaryngology – Head and Neck Surgery, Harvard Medical School, Department of Otolaryngology – Head and Neck Surgery Massachusetts Eye and Ear Boston Massachusetts USA
6. Department of Otorhinolaryngology, University Hospitals Leuven, and Department of Otorhinolaryngology, Upper Airway Research Laboratory University of Ghent GhentBelgium
7. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine Oregon Health & Science University Portland Oregon USA
8. Department of Otolaryngology – Head and Neck Surgery University of California Los Angeles California USA
9. Division of Rhinology and Sinus Surgery, Department of Otolaryngology‐Head and Neck Surgery Medical University of South Carolina Charleston South Carolina USA
10. Department of Otolaryngology‐Head and Neck Surgery Northwestern University Feinberg School of Medicine Chicago Illinois USA
11. National Jewish Health, Departments of Internal Medicine and Pediatrics Pulmonary Divisions Denver Colorado USA
12. Department of Otolaryngology‐Head and Neck Surgery Emory University Atlanta Georgia USA