1. Division of Rhinology and Sinus Surgery, Department of Otolaryngology-Head and Neck Surgery; Medical University of South Carolina; Charleston South Carolina U.S.A
2. Department of Surgery; Ralph H. Johnson VA Medical Center; Charleston South Carolina U.S.A
3. Division of Rhinology and Sinus Surgery, Oregon Sinus Center, Department of Otolaryngology-Head and Neck Surgery; Oregon Health and Science University; Portland Oregon U.S.A