1. Coastal Sinus and Allergy Center; Gulfport MS
2. Coastal Ear Nose and Throat Associates; Gulfport MS
3. Massachusetts Eye And Ear Infirmary; Boston MA
4. Department of Otolaryngology-Head and Neck Surgery; Division of Sinonasal Disorders and Allergy; University of Pittsburgh Medical Center; Pittsburgh PA
5. Otolaryngology; South Texas Veterans Health Care System; San Antonio TX
6. North Oaks ENT and Allergy; Hammond LA
7. Department of Otolaryngology-Head and Neck Surgery; Boston University School of Medicine; Boston MA
8. Henry Ford Medical Group; Sterling Heights MI
9. Department of Otolaryngology-Head and Neck Surgery; Temple University; School of Medicine; Philadelphia PA
10. Avant Garde Medical Care; Boucherville QC Canada
11. Dartmouth-Hitchcock Medical Center; Lebanon NH
12. Department of Otolaryngology-Head and Neck Surgery; Johns Hopkins School of Medicine; Baltimore MD