1. Wayne State University School of Medicine; Detroit Michigan U.S.A
2. Department of Otolaryngology; Harvard Medical School; Boston Massachusetts U.S.A
3. Department of Otolaryngology; Massachusetts Eye and Ear Infirmary; Boston Massachusetts U.S.A
4. Division of Otolaryngology; Beth Israel Deaconess Medical Center; Boston Massachusetts U.S.A
5. Department of Otolaryngology and Communications Enhancement; Boston Children's Hospital; Boston Massachussetts U.S.A