1. Department of Otolaryngology–Head and Neck SurgeryUT Southwestern Medical Center Dallas Texas
2. Department of Otolaryngology–Head and Neck SurgeryUniversity of Southern California Keck School of Medicine Los Angeles California
3. Department of Otolaryngology–Head and Neck SurgeryMassachusetts Eye and Ear Infirmary, Harvard Medical School Boston Massachusetts
4. Department of Otolaryngology–Head and Neck SurgeryJohn H. Stroger Hospital of Cook County Chicago Illinois U.S.A.