1. Division of Otolaryngology-Head and Neck Surgery; University of Wisconsin-Madison; Madison U.S.A
2. Department of Otolaryngology-Head and Neck Surgery; University of Iowa Hospital and Clinics; Iowa City Iowa U.S.A
3. Department of Otolaryngology & Communication Sciences; Medical College of Wisconsin; Milwaukee Wisconsin U.S.A
4. Department of Communication Sciences and Disorders; University of Iowa; Iowa City Iowa U.S.A
5. Department of Anatomic Pathology; University of Iowa Hospital and Clinics; Iowa City Iowa U.S.A