1. Columbia University Medical Center Department of Otolaryngology New York New York
2. Division of Laryngology and the Professional Voice Department of Otolaryngology and Communication Science Medical College of Wisconsin Milwaukee Wisconsin
3. Emory Voice Center Atlanta Georgia U.S.A.
4. Department of Otolaryngology–Head & Neck Surgery, Emory University School of Medicine Atlanta Georgia U.S.A
5. Columbia Voice and Swallowing Institute New York New York