1. University of Utah
2. University of Colorado
3. Stanford University
4. Oregon Health Science University
5. University of Chicago
6. Rush University
7. Universidad de Barcelona
8. Harvard Medical School
9. Vanderbilt University
10. University of Arizona
11. University of Texas Medical School at Houston
12. University of Pennsylvania
13. Emory University
14. Université de Montréal
15. Samsung Medical Center
16. University of Auckland
17. University of Pittsburgh
18. University of Amsterdam
19. University Hospital, Leiden, Netherlands-Hygeia Hospital; Athens Greece
20. University of California; San Francisco
21. Dr. Horst Schmidt Kliniken
22. Massachusetts General Hospital
23. Eastern Virginia Medical School
24. University of New South Wales and Macquarie University
25. University Hospitals Leuven
26. Guy's Hospital
27. University of Lorraine
28. University of British Columbia
29. Northwestern University
30. Georgia Regents University
31. Medical University in Lodz
32. Johns Hopkins University
33. Sinus & Nasal Institute of Florida
34. Foundation New York University
35. Korea University
36. Royal National Throat Nose and Ear Hospital; London UK
37. Private Practice
38. University of Texas, Southwestern
39. Uniformed Services University of Health Sciences
40. Jikei University
41. University of Washington
42. University of Siena
43. Washington University
44. Medical College of Wisconsin
45. University of Adelaide
46. West Virginia University
47. Medical University Innsbruck
48. Pusan National University
49. University of Calgary
50. University of New South Wales
51. Medical University of South Carolina
52. University of North Carolina
53. Cleveland Clinic Foundation
54. Loyola University
55. Weill Cornell Medical College
56. Temple University
57. Universidade de São Paulo
58. National University of Singapore
59. San Antonio Military Medical Center
60. University of Alabama at Birmingham
61. University of Alberta
62. Capital Medical University