1. Columbia University Medical Center New York New York U.S.A.
2. Advanced ENT & Allergy Louisville Kentucky U.S.A.
3. South Carolina ENT Allergy & Sleep Medicine Columbia South Carolina U.S.A.
4. South Florida Pediatric Otolaryngology Fort Lauderdale Florida U.S.A.
5. Sacramento Ear Nose and Throat Roseville California U.S.A.
6. Ear Nose and Throat Specialists of Abilene Abilene Texas U.S.A.
7. Charlotte Eye Ear Nose & Throat Associates Matthews North Carolina U.S.A.
8. California Head and Neck Specialists Carlsbad California U.S.A.
9. Frisco ENT for Children Frisco Texas U.S.A.
10. Albany ENT and Allergy Albany New York U.S.A.
11. Yale New Haven Children's Hospital New Haven Connecticut U.S.A.
12. Carolina Ear Nose & Throat Clinic Orangeburg South Carolina U.S.A.
13. Specialty Physician Associates Bethlehem Pennsylvania U.S.A.
14. British Columbia Children's Hospital Vancouver British Columbia Canada
15. Camino Ear, Nose & Throat Clinic San Jose California U.S.A.
16. ENT Clinics of San Antonio San Antonio Texas U.S.A.
17. Nemours Children's Specialty Care Jacksonville Florida U.S.A.
18. Connecticut Children's Medical Center Hartford Connecticut U.S.A.
19. Tusker Medical, Inc Menlo Park California U.S.A.
20. Ear Medical Group San Antonio Texas U.S.A.