| Affiliation: | 1. Department of Otolaryngology/Head and Neck Surgery, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;2. Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas;3. Department of Medicine, Baylor College of Medicine, Houston, Texas;4. Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas;5. Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, Texas |
