1. Department of Otolaryngology-Head and Neck Surgery; Wayne State University; Detroit Michigan U.S.A.
2. School of Communication Sciences; University of Chile and Voice Center, Las Condes Clinic; Santiago Chile
3. Lakeshore Professional Voice Center; Lakeshore Ear, Nose, and Throat Center; St. Clair Shores Michigan U.S.A.
4. Department of Network Management; Barros Luco-Trudeau Hospital; Santiago Chile
5. Department of Otolaryngology, Harvard Medical School, and Department of Otology and Laryngology; Massachusetts Eye and Ear Infirmary, Brigham and Women's Hospital; Boston Massachusetts U.S.A.
6. McLaren Oakland, Pontiac, and Michigan State University; East Lansing Michigan U.S.A.
7. Department of Otolaryngology-Head and Neck Surgery; Emory University School of Medicine, and Emory Voice Center; Atlanta Georgia U.S.A.
8. Department of Otolaryngology-Head and Neck Surgery; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania U.S.A.
9. Department of Otolaryngology-Head and Neck Surgery; University of Michigan Medical Center,; Ann Arbor Michigan U.S.A.