1. Department of Otolaryngology, Division of Neurotology Louisiana State University Health Sciences Center Baton Rouge and New Orleans Louisiana U.S.A.
2. Hearing and Balance Center Our Lady of the Lady Regional Medical Center Baton Rouge Louisiana U.S.A.
3. Department of Otolaryngology Brooke Army Medical Center Fort Sam Houston Texas U.S.A.
4. Department of Surgery Uniformed Services University of the Health Sciences Bethesda Maryland U.S.A.