1. Department of Otolaryngology–Head and Neck Surgery University of Michigan Ann Arbor Michigan USA
2. Department of Otolaryngology–Head and Neck 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 (OHSU) Portland Oregon USA
4. Department of Otolaryngology–Head and Neck Surgery Medical University of South Carolina Charleston South Carolina USA
5. Department of Otolaryngology–Head and Neck Surgery University of Indiana Indianapolis Indiana USA
6. Department of Otolaryngology–Head and Neck Surgery University of California Los Angeles California USA